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3 Written questions

3 Multiple choice questions

  1. a process that continually adds new material to the ocean floor
  2. deep underwater canyons
  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. mid-ocean ridgean undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.


  2. What is the process of 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.