Natural disaster

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Across
  1. 2. a series of huge tidal waves
  2. 6. sudden shake of the earth's crust
  3. 7. a numerical scale for expressing the magnitude of an earthquake
  4. 8. outer covering of the earth
  5. 9. a period of abnormally low rainfall
Down
  1. 1. a sudden accident that causes great damage
  2. 3. pieces of Earth's crust and uppermost mantle
  3. 4. a mountain that opens downward to a pool of molten rock
  4. 5. an instrument used to measure and record details of the earthquake