natural disasters

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Across
  1. 4. people who try to predict earthquakes
  2. 6. a_________ is caused by an undersea earthquake or cyclone
  3. 7. a instrument used to detect earthquakes
  4. 8. a volcano that has not erupted in recent years but may in the future are called __________
Down
  1. 1. hot lava, ash escape from the __________ of the volcano
  2. 2. an opening on the earth's surface which allows lava to escape
  3. 3. earthquakes are measured on the _________
  4. 5. a sudden shaking of the ground