Class VIII

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
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. None of these
The observation that the continents fit together like puzzle pieces, and may once have been connected, led Alfred Wegener to propose a theory in 1910 called
  1. continental plowing
  2. continental drift
  3. wandering continents
  4. shape matching of continents
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
Plate tectonics can also be the direct cause of forming
  1. lakes
  2. streams
  3. mountains
  4. oceans
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