Have you ever stopped to think about just how fascinating the Earth is? The planet that we call home is the only place that we know of that has life. Also, there are remarkably diverse forms of life, from the bottom of the ocean to some of the coldest, most remote landforms. Geologically, the processes shaping our planet for billions of years are continuing to this day, creating spectacular formations and new ecological systems. Read on to learn some staggering and downright strange facts about the planet we call home.<\/p>\n
You may not know this, but snowflakes are made when multiple snow crystals stick together – we’re talking hundreds! The number of snow crystals that fall to the Earth each year is about one <\/span>septillion<\/span><\/em> – that’s 24 zeros! A snow crystal starts as just a little grain of dust in a cloud, but as water vapor condenses on the grain and freezes, it forms a crystal. Scientists have determined that the ideal temperature for snow crystals to grow the fastest is 5 degrees Fahrenheit because it has something to do with how the water molecules cluster on the ice.<\/span><\/p>\n
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The longest mountain chain on the Earth’s surface is the Andes, which runs like a corridor through South America. This chain is 4300 miles long, which may sound like a lot, but it is nothing compared to the Mid-Ocean Ridge. The Mid-Ocean Ridge<\/a>, which stretches over 40,390 miles long, runs throughout the Earth’s oceans like the seams on a baseball. The Mid-Ocean Ridge is around 90% underwater and was formed by tectonic activity that caused magma to push up onto the ocean floor’s surface. Many of the mountains in the chain are volcanoes that erupted underwater.<\/p>\n
Tectonic plates are basically giant slabs of rock – think thousands of kilometers across in size. The largest plates are the Pacific and Antarctic plates. As they shift or separate, they allow the molten rock to rise to the seafloor, which then creates the ridges we’re talking about. Their size and shape are also affected by the speed at which the molten rock spreads – faster spreading creates steeper peaks, while slower spreading creates wider, more gentle slopes. Believe it or not, we know very little about the mid-ocean ridge system – only about one percent of it has been explored in detail, though we have mapped about half of the ridges in high resolution.<\/p>\n
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When kids draw the Earth, it’s usually an unmistakable circle of green and blue, even if the continents aren’t clear, but that may not have always been the case. The Earth is known as the blue planet because much of it is covered with water, which gives off a blue tint. The rest of the Earth is green because of the plants that use chlorophyll to harness the sun’s rays and convert them into energy. However, some scientists believe that ancient microbes may have metabolized the sun’s rays with retinal, a molecule that is a deep purple color rather than green<\/a>. It means that the early Earth may have been purple rather than the characteristic blue and green that we see today.<\/p>\n
Some scientists speculate that the reason for this puzzling color change – if it is true – is due to the microbe’s evolutionary process. Microbes that used chlorophyll were unable to compete with the ones that needed retinal, but they evolved to use something else – blue and red light since green light was being absorbed. Since chlorophyll production is more efficient, the ecosystem eventually tipped its balance in favor of that. However, that does pose an interesting question: if this is true for Earth, what should we keep in mind when looking for an indication of life on other planets? Perhaps chlorophyll isn’t always the answer.<\/p>\n
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The Valdivia earthquake rocked Chile in 1960<\/a>, measured between 9.4 and 9.5 on the Richter scale, with different measuring equipment recording different intensities. The number of fatalities was estimated between 1,000 and 7,000, with as much as $6.78 billion in today’s dollars in damage. The earthquake was so strong that it sent tsunamis as far as Japan, Hawaii, the Philippines, Australia, New Zealand, and even Alaska’s Aleutian Islands, as far as 6200 miles from the epicenter. The most significant recorded wave from the event was 82 feet high and devastated the coast of Chile.<\/p>\n
There is a reason it was also called the Great Chilean Earthquake! The “megathrust” earthquake lasted approximately 10 minutes, and it seemed to be one of a series of earthquakes in 1960 that affected the country. The series of earthquakes is known as the Concepcion earthquakes. The first three all were registered in the top 10 magnitudes for the year. As a result of the Valdivia earthquake, wetlands were created in the Rio Cruces and Chorocomayo. As if a 9.5 earthquake wasn’t enough, two days later, a volcanic vent, Cordon Caulle, erupted!<\/p>\n
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A glacier is a vast mass of ice that moves slowly over land, which is not to be confused with an iceberg, and they are grouped into two categories: alpine glaciers and ice sheets. Essentially, snow becomes compressed over the years on these glaciers and eventually fuse into solid ice masses. The glacier’s weight, combined with the meltwater’s slickness, makes it glide along the landscape. The Canadian Arctic glacier<\/a> is about the size of New York’s state, and as it melts, it contributes to 90% of the ice melt that is causing sea levels to rise. Between the years 2004 and 2009, it lost enough ice to fill 75% of Lake Erie.<\/p>\n
However, other ice sheets are also melting at increasingly rapid rates due to climate change. The Greenland ice sheet drew international attention during the summer of 2019 when its melt rate caused it to lose billions of gallons of ice each day. Glaciers in Alaska and the Antarctic ice sheet are also losing vast amounts of ice in increasingly large numbers. Meltwater provides drinking water for a significant amount of the world’s population and provides water for agricultural irrigation and hydroelectric power. The cities that mostly utilize meltwater include areas in Australia and on the Western coast of North America.<\/p>\n
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If you look in the mirror and notice a bit of a muffin top or spare tire around your middle, you aren’t alone. The Earth has one, too. The planet may look like a perfect sphere to our naked eye, but in fact, it bulges out slightly at the equator<\/a>. That is because of its rotation, which is happening at 1000 miles per hour. If you measure the distance between sea level and the core of the Earth at the equator, that distance is about 13 miles greater than that at the poles.<\/p>\n
It may not be enough of a difference for you to see it in a photograph, but enough that Mother Earth might feel a bit self-conscious in a bikini. The shape is best described as “oblate spheroid,” but even that isn’t entirely accurate. The easiest solution is for people just to call it round. It’s not a perfect oblate spheroid. Why? The Earth’s mass is distributed unevenly, depending on how mass is distributed. There is a higher concentration of mass. There will be a higher gravitational pull, creating more bumps. The difference in some areas may be as minute as a centimeter, but it’s still not a perfect circle.<\/p>\n
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Even when you’re sitting still, you’re moving through space at an incredible rate. With faster motion near the equator and slowing down at the poles, the rotation of the Earth creates the energy to circulate the air and water across the planet. This assists in regulating temperatures in both mediums – for example, the Gulf Stream carries warm water from the Gulf of Mexico to Great Britain! In addition to spinning 1000 miles per hour, the Earth rotates the sun at a breakneck speed of over 66,000 miles per hour<\/a>! We don’t feel the dizzying effects of this perpetual motion because we have no constant to measure it against.<\/p>\n
This rapid movement is all that we have experienced. Nevertheless, add to the Earth’s axial and orbital rotations that the solar system itself is in orbit, moving at speeds of 560,000 miles per hour around the center of the Milky Way Galaxy. It takes the sun a “galactic year” to orbit our galaxy – 225 million years! In all our recorded history, we have barely moved in our path around the Milky Way. The galaxy is spinning around other galaxies inside the universe. For all we know, the universe itself is revolving around some great unknown.<\/p>\n
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We’ve already talked about how you’re moving without even being consciously aware of it. The Earth rotates at a remarkably fast speed – 1,000 miles per hour<\/a>, or nearly 500 meters per second! Each day is 24 hours long, but the actual time down to seconds is 23 hours, 56 minutes, and 4.09053 seconds. Keeping that up instead of rounding up to an even 24 would turn into a nightmare very quickly – that’s why we have leap years. Twenty-four hours (or 23 hours, 56 minutes, and 4.09053 seconds) is what we call the “sidereal period,” or the time it takes for a celestial body to complete one revolution concerning a fixed point outside the system.<\/p>\n
The rotation speed we experience means that you travel almost one-half a kilometer every second without even moving your feet off the ground. Depending on where on Earth you are, you may be moving at a slower or faster speed. Earth rotates fastest around the equator, so you move faster than anyone else if you are in a tropical area. If you are on one of the poles, you are rotating in place. That is kind of like the way that a basketball spins on someone’s finger. If you want to experience this in a real-world application, try looking at a star at night through a telescope and see how quickly it moves out of the frame!<\/p>\n
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That’s right. The North Pole is moving, and it’s everyone’s fault. You may have heard before that the magnetic north pole and the geographic north pole are not in quite the same spot. That is partly because as the Earth moves through space, it wobbles a bit, causing the north and south poles to draft somewhat in cycles that last about a decade. Poles tend to move in directions of missing mass. Climate change leads to melting polar ice and depleting Eurasian aquifers. However, the north pole is drifting eastward at a breakneck speed of 17 centimeters per year.<\/p>\n
The North Pole is now moving towards Greenwich, England<\/a>, where the prime meridian runs. For context, it had been moving toward Canada at the pace of about seven or eight centimeters annually. In 2000, the North Pole changed direction towards the British Isles. Scientists are excited about the research highlighting the human impact on the planet and assure us that there is nothing to worry about; this is just another effect of climate change. They have also previously discovered that humans aren’t just changing the direction of the axis, we’re also making it spin more slowly!<\/p>\n
For this to make sense, let us give you some context first. The Earth’s core contains liquid iron, which generates a magnetic field and protects us against the sun’s radiation. You’re probably thinking, “Ok, but North is always north, and the south is still south, right?” Not so much. The planet’s poles are determined by its strong magnetic fields fueled by this rotating iron core we mentioned. Storms that occur inside the Earth’s core cause the magnetic field to shift periodically. The area can even completely change its polarity, with the North Pole and the South Pole switching “places,” so to speak.<\/p>\n
This event is called “reversal<\/a>” and is entirely natural. It’s not at all anything to worry about – in fact, the last time it happened was about 780,000 years ago, though it could happen more frequently. A few are worried about the impact on animal life, but other scientists study these events through fossil records, and they have found that pole reversals have no significant effect on plant and animal life. Some scientists say we’re probably due for a reversal soon, but that could mean hundreds or thousands of years before the next reversal. Time works differently for Planet Earth!<\/p>\n
It seems almost crazy that we know more about our moon and the nearby planets Venus and Mars than we do about our own oceans, but there’s a valid reason for that. Exploring the deep oceans is remarkably tricky because saltwater distorts radio waves and causes equipment to fail. At intense levels, the water pressure destroys many measuring instruments. As a result, scientists have only explored about 5% of the ocean<\/a> floor, even though nautical exploration is almost as old as humankind. Hundreds of thousands of nautical miles are covered each day between cruises, commerce and container shipping, and personal sailing – all without us having explored much of the sea.<\/p>\n
Increasingly better technology has allowed us to make more detailed maps than ever, with resolutions of up to three miles, but that isn’t enough. The ocean can get up to 7 miles at its deepest point: the Mariana Trench. We have better plans for other solar system bodies than we do for our own oceans. The oceans make up about 70% of our planet’s surface, which means we’re incredibly uninformed of what happens on our own planet. However, it is much easier to send an exploratory team to space than to send one underwater.<\/p>\n
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You may think of Antarctica as a land of constant snowfalls, and you would be partially correct. Nevertheless, frozen climates, like the Arctic tundra of Alaska, Canada, and Siberia, are often classified as deserts because they either receive so little precipitation or because the snow does not melt into the ground, leaving it very dry. The driest spot on Earth is a place known as Dry Valley<\/a>, and it is in Antarctica. This location has seen no precipitation – no rain, snow, sleet, or hail – in over two million years. The area is so dry that scientists have found mummified seal bodies because the carcasses dried out.<\/p>\n
The Dry Valleys make up about 4800 square kilometers and makeup approximately 0.03% of the continent. Despite the name, there are lakes there: Lake Vida, Lake Vanda, Lake Bonney, and the Onyx River. The reason there are no rains is due to Katabatic winds. These winds are so heavy with moisture. Gravity pulls them away from the Valleys! Interestingly, Lake Bonney is always covered with 3 – 5 meters of ice, and Lake Vanda is three times saltier than the ocean! The Onyx River is a meltwater stream and happens to be Antarctica’s longest river.<\/p>\n
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In addition to the continuous belts of volcanic activity on the ocean floor, there are about 1,500 potentially active volcanoes<\/a> on the Earth’s crust. Five hundred of them have already erupted. A dormant volcano refers to exploding in the past and, though not currently erupting, could erupt again. Mount Saint Helens, located in Washington State, was a dormant volcano that was thought to be dead before its massive explosion in 1980. This volcano is part of a collection of volcanoes known as the Ring of Fire, which roughly circles the Pacific Ocean.<\/p>\n
Most of the world’s potentially active volcanoes are located in the Ring of Fire, but there are plenty in other parts of the world with tectonic activity. In the United States alone, there are currently about 169 potentially active volcanoes! The world’s five most active volcanoes include the Sangay volcano in Ecuador, the Santa Maria Volcano in Guatemala, the Stromboli Volcano in Italy, Mount Etna in Italy, and Mount Yasur in Vanuatu, which is part of the Ring of Fire. The length of these volcanic activities ranges from 94 years to 111 years!<\/p>\n
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A supervolcano is more than a mountain with the potential to spew fire and ash into the atmosphere. It is a massive landform that, were it to erupt, could bring human civilization – and potentially all life on Earth – to its knees. Supervolcanoes have a “Volcanic Explosivity Index” or VEI of 8, which is the largest recorded value on the index. The most famous and possibly most heavily studied supervolcano is the Yellowstone National Park<\/a>. Yes, the entire park is a volcano. There are no volcanoes inside the park; the park is the volcano! These monsters erupt about every 100,000 years, and scientists are concerned that the Earth may be due for another supervolcano eruption soon.<\/p>\n
Supervolcanoes are created when magma rises into the crust but doesn’t breakthrough. The pressure builds into a large pool of magma until the crust cannot hold it any longer. Any supervolcano eruption can trigger long-term climate change effects – think Ice Age – and can lead to the extinction of a species or several of them. The most recent supervolcano eruption was when the Taupo Volcano exploded 26,500 years ago. The word “megacaldera” sometimes refers to a caldera supervolcano, like the Blake River Megacaldera Complex in Canada. What a tongue twister; try saying that ten times fast!<\/p>\n
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We have already touched a bit on this, but let’s explore the concept a bit further. There are two types of days, as measured on Earth. A sidereal day refers to how long the Earth takes to spin once on its axis, which is about 23 hours, 56 minutes, and four seconds<\/a> (give or take a few milliseconds). It’s essentially the Earth’s time to rotate on its axis concerning the stars. However, that isn’t necessarily how long it takes for the sun to return to the sky’s same position, which we consider a solar day.<\/p>\n
A solar day refers to how much time the sun spends catching up to Earth’s rotation to return to the same spot in the sky, and it is about 24 hours. But not exactly! That number can deviate by up to 16 minutes, based on what season we are currently in – that’s because our orbit is elliptical instead of perfectly round. A solar day is a time the Earth takes to rotate about its own axis so that the sun appears in the same position in the sky. It’s all based on solar time, of course – calculating the passage of time-based on the sun’s place in the sky.<\/p>\n
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It may sound crazy because we assume gravity is a constant, but it varies because the planet is not perfectly spherical – it’s an oblate spheroid, remember? Due to the Earth’s rotation, gravity at the north and south poles<\/a> is slightly greater than that at the equator. The distance between their centers of mass affects the gravitational force between them, so the force of gravity on an object is smaller at the equator compared to the poles. Essentially, this all means that you would weigh more standing on the poles than if you were in the tropics, even if your mass never changed!<\/p>\n
It also means that if you were falling from the same height of about 100 meters at each point, you’d hit the surface in Peru about 0.16 seconds later than you would in the Arctic! Additionally, because the composition of the ground beneath your feet is different depending on where you are, gravity may behave differently. High-density materials and higher concentrations of mass, like mountains made of granite, can increase the force of gravity pressing down on you. However, you likely wouldn’t even notice the effect, as it would be too small.<\/p>\n
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About 71% of the Earth’s surface is covered in water, with the oceans containing about 96.5% of all of that. Over 96% of the water on the Earth’s surface is saline<\/a>, meaning it has salt content in it instead of freshwater. Don’t worry, though. There is much more freshwater stored in the ground – think of aquifers, for example. Melting glacier water and the water cycle keeps these underground reserves filled as water evaporates from the air’s surface, condenses and turns into vapor, and falls again in the form of precipitation.<\/p>\n
The Pacific Ocean covers a vast amount of space – more than 60 million square miles, or 30% of the world’s entire surface. Given that Earth’s landmass is just under 30% of its surface, all of the continents and islands could comfortably fit inside the Pacific Ocean. This ocean’s average depth is 13000 feet, and it holds the world’s deepest point, the Mariana Sea Trench, which is 36000 feet underwater. Over half of the world’s liquid water is found inside the Pacific Ocean, whose name is derived from how calm and peaceful (pacific) its waters are.<\/p>\n
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Any given minute, over one thousand thunderstorms are happening! That means that there are about 6000 lightning flashes on Earth every minute<\/a>, or 100 every second. They are more common in warmer climates but can occur almost anywhere. Thunderstorms are caused by currents of air rising and falling rapidly. These currents create friction, which essentially causes static. Most of the electrical energy in a thunderstorm is dispersed within the clouds, but lightning can sometimes reach Earth. That’s when it becomes more dangerous. Clouds on Earth are giant batteries because they are full of positive and negative charges. When they discharge, we see the effect in the form of lightning.<\/p>\n
Each bolt of lightning is extremely hot – about five times hotter than the surface of the sun! The expansion of air caused by this burst of heat leads to a shockwave, which we experience as thunder. About one hundred US residents are killed by lightning each year, so it’s not something to mess with! Each lightning charge contains about 30 million volts – which means the total energy in a large thunderstorm can be greater than a single atomic bomb! If a thunderstorm warning is issued when you’re home, it’s best to unplug appliances and keep them away from windows. If you aren’t home, try to find a close, low-lying shelter or building. Assume a tucked position and avoid laying flat on the ground.<\/p>\n
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The Great Barrier Reef<\/a> is one of the most biodiverse ecosystems on the planet, containing over 1600 different types of fish, 600 types of corals, and 100 types of jellyfish. Many of these species cannot be found anywhere else in the world. Located off the coast of Queensland, Australia, this massive body is about half the size of Texas or Japan’s total size! However, the Great Barrier Reef’s long-term prognosis is not suitable due to climate change and other human-caused factors leading to ecological degradation and breakdown. If current trends continue, this jewel of the seas will be completely dead within a decade.<\/p>\n
This current reef formation is about six thousand to eight thousand years old; estimates are that it began forming during the Last Glacial Maximum. That makes it all the more disheartening that climate change and human impact is rapidly killing it off! The reef is large enough to be visible from space and comprises nearly 3,000 smaller, individual, interlinked reefs. These reefs are all divided by narrow passages just below the surface of the Coral Sea. Most of the Great Barrier Reef is a marine protected area and is managed by the Marine Park Authority of Australia. It was even chosen as a World Heritage Site in 1981.<\/p>\n
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When you think of volcanic activity, specific “heavy hitter” names must come to mind, like Mount Vesuvius or Mount St. Helens. For example, Kilauea has been continuously erupting since 1983, complete with lava flows at times! In 1980, Mt. St. Helens erupted, leaving a casualty count of 60 people and erased 232 square miles of forest. Though dormant for now, Mount Vesuvius buried the entire town of Pompeii in AD 79, and scientists think the next eruption could be even bigger! However, there are many impactful volcanoes that you may not be aware of.<\/p>\n
Indonesia is a collection of islands in the South Pacific that has seen its fair share of volcanic activity. It is the home of the infamous Krakatoa and Anak Krakatoa, both of which have earned their volcanic lore places. It is also home to Tambora<\/a>, a volcano that blew its lid in 1815, killing over 60,000 people, causing ten meter-high tsunamis, and triggering a global mini ice age. Of course, there have been more significant volcano eruptions throughout history, including eruptions of massive supervolcanoes. Some prehistoric volcanic eruptions were so extensive that they nearly caused nascent humanity to go extinct. However, we don’t have exact numbers for how many people died in these eruptions.<\/p>\n
Death Valley, California, is located 190 feet below sea level and averages daytime temperatures of 115 degrees Fahrenheit. For our college football fans, we’re not talking about Louisiana State University’s football stadium! The area’s name isn’t just for show, though. In 1913, it set a world record when a staggering temperature of 134 degrees Fahrenheit<\/a> was recorded at a site there known as Greenland Ranch. Though that claim was later set aside as “not possible from a meteorological perspective” because it did not align with other observations made in the region, the same area recorded 130 degrees Fahrenheit in August 2020. That was just the air temperature.<\/p>\n
Temperatures on the ground at Death Valley are even hotter. In 1972, a ground-level measurement recorded a temperature of 201 degrees Fahrenheit, only 11 degrees away from water’s boiling point. The place’s intense heat is due to its low altitude and arid climate, which averages less than three inches of rainfall per year. It sits 282 feet below sea level and is the lowest, driest, and hottest location in the United States. Though there may be hotter places than Death Valley, they are too remote for reliable monitoring – and who wants to be out in that heat, anyway?<\/p>\n
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From one extreme to the other: we head to Antarctica, a place inhabited only by some hardy forms of wildlife and international teams of scientists. Most temperature records tend to stay constant for very long periods, though we see more and more record-breaking extremes in recent times. In 1983, at a Russian research station in Antarctica known as Vostok, an air temperature of -128.6 degrees Fahrenheit was measured, setting a world record. Another temperature reading in 2013 in central Antarctica on the East Antarctic Plateau, which encompasses the South Pole, measured at over –135 degrees Fahrenheit<\/a>, but this measured surface temperature, not air temperature.<\/p>\n
However, scientists generally agree that had the air temperature been measured, it would have been colder than that brutal day at Vostok in 1983. Researchers have revised that study since and found that temperatures can even reach -144 degrees Fahrenheit during the polar night. Talk about bone-chilling! This record is about as cold as it is physically possible for the Earth’s surface to get. For the temperature to get that low, clear skies and dry air need to persist for several days. Basically, after the temperature gets beyond a certain point, the air cools so slowly that it can’t get noticeably colder before the weather conditions change again.<\/p>\n
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One day today is about 1.78 milliseconds longer than one day a century ago. This figure is because the Earth’s spin is slowing down at rates so slight that they are undetectable unless you travel back thousands of years. So that’s precisely what scientists did. They looked at ancient records of eclipses and found that one eclipse, measured by Babylonian astronomers in 780 BCE, should have happened one-quarter of the Earth away. Comparing these findings to other records, they discovered that the planet’s rotation has slowed down enough to have lost about six hours in the past 2740 years<\/a>.<\/p>\n
“But, why – now?” you may be asking. Well, let’s look into that. It’s mainly because of the tidal forces between the moon and the Earth. Approximately every century, the day gets about 1.4 milliseconds longer. That may not seem like much, but when you add up all the centuries the Earth has been through, you can see where we’ve gotten to such a big difference. In fact, June 30, 2012, got one extra second in the day as a “leap second” to provide a standard time across the world – basically to keep UTC timing (Coordinated Universal Time). It sounds fancier than it was; it just meant clocks and timekeeping apps switched off for one second.<\/p>\n
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Scientists believe that stars created all of the elements on Earth. This notion is because the nuclear fusion that happens inside stars turns hydrogen into helium. Once the hydrogen stores are depleted, stars fuse increasingly heavier elements until they explode. In the explosions, elements like gold and platinum are formed. They gradually made their way to Earth through comets and asteroids. However, earthquakes can also create small amounts of gold<\/a>. Who knew that Earthquakes had the Midas touch? There are seas of water inside Earth’s mantle, and when earthquakes happen, the water vaporizes and mixes with silica. A sudden drop in pressure in underground fractures causes the fluids to expand and evaporate in a process called flash vaporization.<\/p>\n
The result is gold, though it is still trapped far beneath the Earth’s surface. Though it may not happen after one earthquake event, successive earthquakes in the same area can create a buildup of deposits and eventually lead to a significant gold concentration! Gold is usually found in quartz veins formed long ago when mountains were building up and deposited by large volumes of water along earthquake faults. Most gold mined already has been near, or on the Earth’s surface, so now miners are looking deeper into the crust. As scientists learn more about what creates these deposits, they can look for indications and guide their mining efforts.<\/p>\n
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The highest point on Earth is Mount Everest in the Himalayas, a mountain range that cuts through the Asian countries of Nepal and Tibet. At 29,035 feet above sea level, summiting this monster of a mountain is no small feat. The first person to scale Everest was Sir Edmund Hillary, who summited the mountain in 1953. In his honor, there is even a peak in the Himalayas named after him. In the time since climbing the mountain has become a daredevil challenge. To date, over 3100 people have scaled Everest<\/a>, though not everyone has made it back down.<\/p>\n
The mountain gained new media attention in the summer of 2019 when a line of people who had climbed it had to wait their turn to make their mark on the summit. Over three hundred people have died while attempting the ascent, and many of their bodies are still on the mountain, as it is too challenging to try to retrieve them. Unfortunately, some of them are buried in deep crevasses. Some have even been moved because of the nature of moving glaciers they had fallen into. Despite the intense danger that climbing Everest inherently carries, many continue to aspire to reach its summit.<\/p>\n
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The deepest point on Earth is Challenger Deep, and it is located inside the Mariana Sea Trench in the Pacific Ocean. The depression is named after a British Royal Navy ship, the HMS Challenger, which first made the recordings of its depths in the 1870s. The spot is 35,856 feet below sea level and is located between Japan and Papua New Guinea, an island off Australia’s coast. Despite the place’s incredible depth and massive pressure, many life forms exist there, including sea cucumbers and shrimp. The calcium animals need to form shells dissolves too quickly at that depth, so it is unlikely that shelled creatures would live in the trench.<\/span><\/p>\n
Only thirteen people have visited Challenger Deep, one of whom is James Cameron<\/a>, the movie director behind the blockbuster hits <\/span>Titanic <\/span><\/em>and <\/span>Avatar<\/span><\/em>. In March 2021, he crewed the deep-sub vehicle “Deepsea Challenger,” to the bottom of the Challenger Deep. His descent took over two and a half hours, and at the time, he was only the third person ever to visit that incredibly lonely place. After about six hours in the trench, he came back to the surface – seven miles up! The trench pressure is about the equivalent of eight tons pressing down on the sub, so the research and preparation in advance of this deep-sea dive were immense. <\/span><\/p>\n
To put it differently: about 70% of our freshwater is frozen<\/a>! Fully 90% of the planet’s ice is trapped in Antarctica. The southernmost continent was almost entirely frozen over. This “Antarctic ice sheet” covers nearly fourteen million square kilometers and contains over thirty million cubic kilometers of ice. Were all of the ice in Antarctica to melt, sea levels would rise by over 180 feet worldwide. This action makes the rapid warming of Antarctica and the rest of the world particularly troublesome. As temperatures rise, the melting of the polar ice sheets accelerates.<\/p>\n
As Dr. David Wilson, a researcher from Imperial College London, puts it, “With current global temperatures already one degree higher than pre-industrial times, future ice loss seems inevitable if we fail to reduce carbon emissions.” In some parts of Antarctica, the ice is so thick that it is nearly 16000 feet deep, which means the ice is about three miles thick! Most of the rest of the world’s ice is trapped in glaciers and ice sheets in Greenland, Alaska, and Canada, but those only make up about 2% of the world’s ice sheets volume.<\/p>\n
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In Canada, rocks that were about 4.03 billion years old were discovered. In Australia, researchers found minerals that dated about 4.3 billion years back. Scientists have been trying to determine a more accurate range for the Earth’s age for over four hundred years. At first, they tried to predict the age based on changing sea levels, but that proved unreliable, as that is a cyclical process more than a gradual one. To more closely determine the Earth’s age, scientists tried dating the oldest rocks that they can find, and meteorites that have smashed into the planet since meteorites and the Earth formed at approximately the same time.<\/p>\n
In the early 20th century, they refined the process of radiometric dating – essentially figuring out which elements decay into other features at a predictable rate and using that math to calculate its age backward. What they have found is that the Earth is quite old indeed. It is about 4.54 billion years old<\/a>, give or take about fifty million years. After the sun formed, remaining debris from the stellar cloud coalesced into the planets, meteors, and asteroids that we know today. This process is currently happening throughout the universe, creating new worlds, possibly some like our Earth.<\/p>\n
We all know about the water cycle, but do you remember the rock cycle? When you were in middle school, you probably learned the three main kinds of rocks: igneous, sedimentary, and metamorphosis. The rock cycle roughly goes like this: molten magma inside the Earth’s mantle and comes to the surface through fissures and volcanic eruptions. The rocks that the magma cools into are known as igneous. As the igneous rocks from the explosions, like pumice and obsidian, erode and break down, they become transformed into sedimentary rocks, like sandstone. As layers of sedimentary rocks get pushed down and heated, they turn into metamorphosis rocks.<\/p>\n
They can continue to get pushed down into the mantle and get spewed out as igneous. All that is to say, the cycle forms old rocks into new rocks. Another version of the planet “recycling” itself is crustal recycling<\/a>. Though the terminology for this process can become quite cumbersome, the process itself is more or less straightforward: the interaction between the land and water on the Earth’s crust causes rocks to be heated, changed, melted, or eroded. Sediment is then transported and deposited, where it is impacted by whichever elements (buried, compressed, or lithified, for example) until it goes through the cycle all over again.<\/p>\n
There are seven continents: North America, South America, Europe, Asia, Africa, Australia, and Antarctica. The largest, both by landmass and population, is Asia. The smallest continent by size is Australia, but Antarctica is the fifth-largest<\/a>. This icy continent contains 90% of the world’s ice and 70% of its freshwater. Though Antarctica is significant, it doesn’t have any permanent population. Other than the wildlife that thrives in its extreme cold, it is populated only by international teams of scientists, who stay on research bases. There have been squabbles over who will get first dibs on its mineral resources as the ice continues to melt.<\/p>\n
Antarctica is our southernmost continent and contains the geographic South Pole. Its name is derived from the Greek word meaning “opposite to the Arctic,” or “opposite to the North.” Climate-wise, it is the coldest, driest, and windiest continent, with the highest average elevation of all continents. It’s called a “polar desert,” as we have mentioned previously, so it’s not exactly an ideal living place. Interestingly, it was the last region on Earth to be discovered; it was not recorded in history until as late as 1820 when a Russian expedition found one of its ice shelves.<\/p>\n
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You, like many others, may have a hard time telling stalactites from stalagmites. Here’s a helpful trick to remember: G for Ground and C for Ceiling. Now, onto the real facts! Stalagmites build upon the floors of caves because of minerals that get deposited, usually from dripping water. Their cousins are stalactites, which grow on caves’ roofs when dripping water leaves minerals behind, which accrue into the spiky formations. They only form in specific conditions when the pH conditions are suitable, which is why they’re not found in every cave. They shouldn’t be touched because skin oils can alter the surface tension of the formation’s growth and can even stain the formation’s coloring.<\/p>\n
Stalactites and stalagmites are usually only a couple of feet in height. However, at the Cuevo San Martin Infierno cave in Cuba, spelunkers found a stalagmite that measures 220 feet tall! Unfortunately, the Cuevo San Martin Infierno cave is not open to the public. If you still need a stalagmite and stalactite cave to scratch that itch, try the Jeita Grotto in Lebanon. That’s where you’ll find the world’s largest stalactite! The grotto is a system of two interconnected caves spanning a length of nearly nine kilometers. The lower cave can only be explored with a boat because it channels an underground river that provides fresh drinking water to over 20% of the Lebanese population!<\/p>\n
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