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Cinder cone

Inside a Cinder Cone

WHOI students and scientists investigate a discontinuity between two layers of volcanic rock that form the interior of a cinder cone on Mount Shasta in northern California. Mount Shasta is an arc volcano that formed as the Juan de Fuca tectonic plate bent and plunged beneath the North American plate. The study tour culminated the 2017 Geodynamics Program, a semester-long series of seminars by scientists from around the nation and world. This year's program, led by WHOI geologists Henry Dick and Mark Behn, focused on the formation of the ocean crust and its relationship to mantle circulation. (Photo by Hannah Mark, Woods Hole Oceanographic Institution)

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