Natural Disasters

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Across
  1. 3. An instrument used to detect the earthquake waves from all over the earth.
  2. 4. A sudden shake or movement.
  3. 5. An opening on the earth's surface from which lava erupts.
Down
  1. 1. Tidal waves caused by an undersea earthquake .
  2. 2. An instrument used to measure the magnitude of an earthquake.