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3 Written questions

3 Multiple choice questions

  1. 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. an undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.
  3. 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 True/False questions

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


  2. sonarthe process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle


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