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3 Written questions

3 Multiple choice questions

  1. an undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.
  2. 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.
  3. deep underwater canyons

2 True/False questions

  1. What happens at deep-ocean trenches?In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.


  2. sonara device that bounces sound waves off underwater objects and then records the echoes of these sound waves.