Review

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Across
  1. 3. building cities or roads
  2. 4. cutting down trees for wood, farms, and cities
  3. 7. when air, water, or land gets dirty and harmful
  4. 8. animals that can become endangered
  5. 12. reduces fish population
  6. 14. prevent forest _____
  7. 15. no animals left
  8. 17. when Earth's temperature increases
  9. 19. where an animal lives
  10. 20. may disappear soon
Down
  1. 1. when a natural home for plants and animals is damaged or destroyed
  2. 2. avoid single use _____
  3. 5. fires burn trees and plants
  4. 6. plants or animals that don't belong in an area and cause problems for native species
  5. 9. stop cutting too many _____
  6. 10. too much water can kill plants
  7. 11. place with a lot of trees and rain
  8. 13. use _____ bottles, bags, and straws
  9. 16. lack of rain can dry out grasslands
  10. 18. _____ paper products