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