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Science

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Metamorphic Rocks—Why Rocks Bend And Fold, Part 1: Viewing Structures in the Field and Lab

Run Time: 00:08:53

In this first of three video clips, geologist Keith Klepeis, of the University of Vermont, investigates Clay Point, a rock outcrop on Lake Champlain in Vermont. Klepeis finds a section of horizontal rock layers directly adjacent to an unexpected section of rock layers in a vertical position. He proposes one possible interpretation: that both rock sections were once part of a single rock that was somehow bent or folded. Samples taken to the laboratory reveal that the horizontal layers of rock are sedimentary rocks, and that the vertical, or bent layers of rock, are metamorphic rock. But what force could fold a rock like this, deforming its shape, changing it from a sedimentary rock to a metamorphic rock? Featured Scientist: Keith Klepeis, Ph.D.

Standards

NSES Standard

Grades 5-8 Standard D. Crustal plates constantly move in response to the movements of the mantle.


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