Why is the Grand Canyon so old?

Sixty million years ago, the Rocky Mountains and the entire Colorado Plateau, which the Grand Canyon is part of, rose up from tectonic activity. After the top layers of rock (green) eroded away, the Colorado River grew powerful and began to cut its way through the ancient rock, leaving the stunning canyon we see today.



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Some scientists believe that the Grand Canyon is 70 million years old. Others contend that the natural wonder is only between five and six million years old. Both are right. Scientists examined rocks from the Grand Canyon with the so-called thermo chronology method.

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The rock that makes up the canyon walls is vastly more ancient than the dinosaurs – about a billion years more ancient, in some cases – but the canyon itself probably didn't form until after the dinosaurs were long gone.

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The composition (sandstone) and presence of stromatolites indicate that this area was previously a very shallow sea. The rock layers in the Grand Canyon Supergroup have been tilted, whereas the other rocks above this set are horizontal.

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Over the centuries, the rocks, dirt and silt the Colorado brought down from the Grand Canyon and the rest of its vast drainage basin either settled on what are now the banks of the river or formed an immense delta at its mouth.

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Precipitation falling on the Coconino (South Rim) and Kaibab (North Rim) Plateaus creates Grand Canyon's only native waters - waters derived in place - as they percolate through porous, faulted, and fractured rock units to discharge later as springs and seeps below the canyon's rim.

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The Yarlung Zangbo Grand Canyon in Tibet, a region of southwestern China, was formed over millions of years by the Yarlung Zangbo River. This canyon is the deepest in the world—at some points extending more than 5,300 meters (17,490 feet) from top to bottom.

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The deepest part of the Grand Canyon is 6,000 feet (1,829 meters). The average depth is 1 mile or 5,280 feet (1,609 meters). At the suspension bridge this canyon is 1,053 feet (321 meters) deep. At Artist Point Overlook the canyon is 1,200 feet (366 meters) deep.

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The oldest known rock in Grand Canyon, known as the Elves Chasm Gneiss, is located deep in the canyon's depths as part of the Vishnu Basement Rocks and clocks in at an ancient 1.84 billion years old.

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About 900 people have died in the Grand Canyon. The leading cause of death is airplane and helicopter crashes, followed by falling from cliffs, environmental deaths (such as overheating), and drowning. On average, about 11 people die per year in the Grand Canyon.

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The Canyon Will Change Its “Clothes” As it becomes warmer and drier, you'll see vegetation that is more classic to those environments: piñon-juniper will shift more into just juniper and maybe some grasses, which is the vegetation zone that falls below it.

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Nestled along the Idaho and Oregon border lies one of the greatest natural wonders in North America: Hells Canyon. Carved by the Snake River, the gorge is ten miles wide and plunges 7,913 feet. That's 2,000 feet deeper than the Grand Canyon – making it the deepest river gorge in North America.

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Encompassing an estimated 1,218.37 acres (1,904 square miles), the Canyon is capable of holding 1 – 2 quadrillion gallons of water. Really. If you poured all the river water on Earth into the Grand Canyon, it would still only be about half full.

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Only a mile a deep, Grand Canyon is not the deepest in the world. For example, the Washington's Colombia River Gorge measures over a mile and a half in depth. Though not the deepest, Grand Canyon remains an incredibly impressive natural landform.

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From the top of the Seven Devils Mountains to the deepest part of the Snake River, Hells Canyon is nearly 8,000 feet deep. That's almost 2,000 feet deeper than the famous Grand Canyon in Arizona.

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Called the Mariana Trench, the underwater canyon descends 35,827 feet (10,920 meters) — the Grand Canyon only averages about 4,000 feet (1,200 meters) in depth.

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While the Grand Canyon is well known around the world, there is a lot that you might not know about the national park. The landmark is so big that Rhode Island could fit inside of it, and much of it has yet to be explored. The national park also has diverse wildlife, endangered species, and unexplored caves.

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