4th period science

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Across
  1. 5. mountains getting smaller
  2. 8. acids,batteries and solvents
  3. 10. being able to adapt
  4. 12. makes up everything
  5. 14. large source of water supply
  6. 16. lands become a desert
  7. 20. non living
  8. 21. rule made by an authority
  9. 22. interlocking food chains
  10. 23. living
  11. 24. forest or tundra
  12. 25. Human waste
Down
  1. 1. the action of preserving something
  2. 2. weather conditions
  3. 3. rocks added to a land mass
  4. 4. a species that not native
  5. 6. modification of a natural environment
  6. 7. change of texture by air
  7. 9. branch of science concerned with classification
  8. 11. substance that is toxic to plants
  9. 13. dirty rain
  10. 15. substance used to kill insects
  11. 17. community of living things
  12. 18. area that seperates water that drains into a
  13. 19. black clouds