The Cascade volcanic arc of the northwestern United States isonly about 800 km long. The Andean arc of western SouthAmerica is several thousand kilometers long. Look at a mapshowing the Earth’s plate boundaries, and explain why theAndean arc is so much longer than the Cascade arc

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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The Cascade volcanic arc of the northwestern United States is
only about 800 km long. The Andean arc of western South
America is several thousand kilometers long. Look at a map
showing the Earth’s plate boundaries, and explain why the
Andean arc is so much longer than the Cascade arc

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