ON THIN ICE

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Across
  1. 3. - to not waste electricity
  2. 5. - a flat part of land usually below sea level
  3. 8. - to cover a place with water
  4. 9. - to sink and die
  5. 11. - the plants we grow to eat don't grow properly
  6. 12. - in place of
  7. 13. - An increase in the world's temperature due to pollution
  8. 14. - a repeating change in weather conditions
  9. 16. - to no longer have something(3 forms)
  10. 18. - to move upwards, to go up(3 forms)
  11. 19. - to make less
Down
  1. 1. - the level of hotness and coldness
  2. 2. - to become liquid because of heating
  3. 4. - the action of making the air dirty
  4. 6. - height, position
  5. 7. - the large areas of ice at the polar regions
  6. 10. - to no longer exist or be seen
  7. 15. - a long period without rain
  8. 17. to look for