Landslides occur when material like debris, rock, and soil become dislodged from the earth and slide downward at speeds that can approach 100 miles per hour. David Montgomery at the University of Washington studies past and present landslides to try to understand what causes them. "When Nature Strikes" is produced by NBC Learn in partnership with the National Science Foundation.
Rating 446 Views Updated: Tuesday, August 1, 2017 - 3:00pm
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