the force of nature

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Across
  1. 2. comes before thunder
  2. 3. mud that tumbles down a mountain
  3. 4. too little water
  4. 6. wanting to succeed
  5. 7. small insects
  6. 9. a mountain that has eruptions
  7. 12. many
  8. 13. man made lake
  9. 14. tidal wave
  10. 15. by chance
  11. 17. interrupt by disturbing
  12. 18. become worse
  13. 20. a place where you can get protection
Down
  1. 1. not possible to believe
  2. 5. to deliberately destroy
  3. 7. much water in the wrong place
  4. 8. snow tumbles down a mountain
  5. 10. humidity
  6. 11. storm
  7. 16. rubbish
  8. 19. not broken