Class X

10. Volcanoes occur in similar locations to earthquakes, and are common along plate boundaries. Sixty percent of volcanoes occur surrounding the Pacific Ocean, a location called
  1. "the hot zone"
  2. "the Ring of Fire"
  3. "the Volcano Zone"
  4. ,
3. The development of submarine warfare druing World War II created a pressing need to map the ocean floor. This actually led to research on the ocean floor that would help explain the movement of the continents. What tool was used to do this mapping
  1. underwater cameras
  2. sonar surveys
  3. studies of living things
  4. rock sampling
9. Plate margins are places where much activity occurs. Earthquakes occur, for example, along convergent margins, where plates are
  1. moving apart
  2. sliding past each other
  3. colliding
  4. collafi
3.Scientists found that the continents were moving apart from each other due to magma rising out of mid-ocean ridges, and they called this
  1. sea floor spreading
  2. sea floor rising
  3. changing sea floor
  4. underwater volcanos
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