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3 Written questions

3 Multiple choice questions

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