Why Do Giant Rocks Suddenly Fall From Cliffs?
"In Yosemite Valley, rockfalls can happen every four to five days, where boulders that can be larger than your average car or apartment building thunder down steep mountainsides." - Seeker
A video filmed in Yosemite National Park discussing rockfalls and what triggers them. Featuring USGS engineer Brian Collins and National Park geomorphologist Greg Stock.
View the video.
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