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

2 True/False questions

  1. What happens at deep-ocean trenches?deep underwater canyons


  2. mid-ocean ridgean undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.


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