How to Move a Mountain

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Almost 50 million years ago, the biggest landslide in Earth's history occurred in Wyoming. An entire mountain slid 45 kilometers at one-third the speed of sound. But how could this happen when the slope was only 2 degrees?

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Sources:
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Image Sources:
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https://www.gettyimages.com/detail/video/heart-mountain-aerial-view-wyoming-park-county-united-stock-footage/529750812
https://www.gettyimages.com/detail/video/old-landslide-on-teton-pass-aerial-view-wyoming-teton-stock-footage/530175126?adppopup=true
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https://www.gettyimages.com/detail/video/old-mountain-road-with-landslide-stock-footage/1387892775?adppopup=true
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https://www.gettyimages.com/detail/video/tungurahua-volcano-erupting-stock-footage/473173025?adppopup=true
https://www.gettyimages.com/detail/video/geological-rock-formations-stock-footage/1656754964?adppopup=true
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https://www.loc.gov/resource/highsm.48145/?r=-0.292,-0.013,1.408,0.741,0