Multiple Choice
Which of the following statements best describes the tectonic setting for Mount St.Helens and the other Cascade volcanoes?
A) A chain of young, active volcanoes built on a continental margin above a sinking slab of oceanic lithosphere
B) A chain of old, inactive volcanoes built while western North America moved over a mantle plume
C) Old, deeply eroded volcanoes built before the Pacific Ocean existed
D) Young, deeply eroded, basaltic volcanoes built when western North America was over the present-day site of the Hawaiian hot spot
Correct Answer:
Verified
Correct Answer:
Verified
Q46: In which layer of the Earth does
Q47: Which type of convergence will result in
Q48: During what time period did scientists first
Q49: Which two continents did Wegener cite as
Q50: Samples from the seafloor around the Mid-Atlantic
Q52: A _ is a geographic low, which
Q53: A typical rate of seafloor spreading in
Q54: Why are the mid-ocean ridges higher in
Q55: Where are the majority of transform faults
Q56: Explain how geologists regarded the positions of