Precarious Boulder (IMAGE)

Columbia Climate School

Precarious Boulder

Caption

In New York’s Harriman State Park, geologist William Menke (right) and a student study a precariously balanced boulder that has remained in position for the last 15,000-plus years. It could hold clues to the maximum size of earthquakes over that period.

Credit

Kevin Krajick/Lamont-Doherty Earth Observatory

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