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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. a device that bounces sound waves off underwater objects and then records the echoes of these sound waves.
  3. a process that continually adds new material to the ocean floor

2 True/False questions

  1. What happens at deep-ocean trenches?deep underwater canyons

          

  2. What is the process of sea-floor spreading?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.