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Author Question: How did researchers in the mid-twentieth century obtain ocean floor samples in order to determine ... (Read 25 times)

saraeharris

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on: Jul 16, 2018
How did researchers in the mid-twentieth century obtain ocean floor samples in order to determine the age of the seafloor?
 
  A) Satellite imagine images
  B) Deep-diving manned submersibles
  C) Hydraulic vacuum tubes
  D) Drilling ships

Question 2

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


lindahyatt42

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Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: D

Answer to Question 2

Answer: A


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