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


  2. deep-ocean trenchesdeep underwater canyons