What if ....?

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Across
  1. 1. to become or make something flat
  2. 3. to drop or fall suddenly from a high place
  3. 10. to suddenly release something which has a dangerous effect
  4. 11. a big disaster
  5. 14. to destroy or damage something very badly
  6. 15. to hit something very hard
Down
  1. 2. when rocks or earth suddenly fall down the side of a mountain
  2. 4. to move people from a place where it isn't safe
  3. 5. to explode or throw out fire, normally from a volcano
  4. 6. to cover or fill a place with water
  5. 7. to suddenly fall down
  6. 8. something that tells people about possible danger
  7. 9. a large piece of something
  8. 12. wave a large amount of sea water in a wave which destroys things
  9. 13. a situation where there is a lot of damage or destruction