Earth

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Across
  1. 3. the protection of animals.
  2. 6. the animals of a particular region.
  3. 8. the air that surrounds earth.
  4. 9. the act of cutting down trees.
  5. 11. the gradual destruction by natural forces.
  6. 12. a swamp or other muddy ecosystem.
Down
  1. 1. a forest or other tree ecosystem.
  2. 2. able to be maintained at a certain rate or level.
  3. 4. where animals interact with the environment.
  4. 5. the plants of a particular region.
  5. 7. when plants absorb air and turn the energy to food.
  6. 10. a mixed woodland grassland ecosystem.