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3 Written questions

3 Multiple choice questions

  1. an undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.
  2. In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
  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. sonara device that bounces sound waves off underwater objects and then records the echoes of these sound waves.


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