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3 Written questions

3 Multiple choice questions

  1. the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
  2. deep underwater canyons
  3. In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.

2 True/False questions

  1. sea-floor spreadingan undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.


  2. What is the evidence for sea-floor spreading?Several types of evidence supported the theory of sea floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.


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