Nature and environment

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Across
  1. 1. say somethiing bad may happen before it does
  2. 4. move quickly
  3. 6. think something to be true or possible
  4. 7. cannot be seen
  5. 9. important and not to be wasted
  6. 11. not made by man
  7. 13. play a joke to make fun of somebody
  8. 14. put something in the ground
  9. 16. find the amount,size,weight,etc.of something
  10. 17. shape or kind
  11. 18. move slowly on water or in the air
  12. 19. angry at having to wait
  13. 21. power that makes things work
  14. 22. disappear
  15. 23. something done to change a thing
  16. 25. join together
Down
  1. 2. let a gas, etc. flow out
  2. 3. thick rope of wire which electricity passes through
  3. 5. give and receieve information
  4. 8. unpleasant
  5. 10. words that make something clear
  6. 12. something (i.e. a solid,liquid or gas) used in chemistry
  7. 15. up to the time when
  8. 17. stop moving suddenly
  9. 20. complete
  10. 24. done or happening every month