Yosemite Nature Notes - 10 - Rock Fall

Описание к видео Yosemite Nature Notes - 10 - Rock Fall

Since the glaciers retreated around fifteen thousand years ago, rock fall has been the major force of change in Yosemite Valley. Geologists work to understand this force of nature in order to protect the millions of visitors who come here each year. For an audio described version of this video, go to    • Yosemite Nature Notes - 10 - Rock Fal...  .

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