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

2 True/False questions

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


  2. sea-floor spreadinga process that continually adds new material to the ocean floor


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