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3 Written questions

3 Multiple choice questions

  1. a device that bounces sound waves off underwater objects and then records the echoes of these sound waves.
  2. deep underwater canyons
  3. an undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.

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. What is the evidence for sea-floor spreading?In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them.

          

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