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Question
Mount St. Helens and the other Cascade volcanoes are ________.A) young, active stratovolcanoes built on a continental margin above a sinking slab of oceanic lithosphere
B) a row of young, active, shield volcanoes built as western North America moved over a hot spot deep in the mantle
C) old, deeply eroded stratovolcanoes built before the Pacific Ocean existed
D) old, deeply eroded, basaltic shield volcanoes built when western North America was over the present-day site of the Hawaiian hot spot
Answer
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