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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 process that continually adds new material to the ocean floor
  3. Several types of evidence supported the theory of sea floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.

2 True/False questions

  1. 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.


  2. mid-ocean ridgedeep underwater canyons