Nature

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Across
  1. 4. (of a natural resource or source of energy) not depleted when used
  2. 7. the protection of plants and animals, natural areas, and interesting and
  3. 8. a biological community of interacting organisms and their physical environment
  4. 10. the action or process of throwing away or getting rid of something
  5. 11. the ability to be maintained at a certain rate or level
Down
  1. 1. the natural home or environment of an animal, plant, or other organism
  2. 2. the action of clearing a wide area of trees
  3. 3. the variety of plant and animal life in the world or in a particular habitat
  4. 5. to remove impurities from substances
  5. 6. a substance that pollutes something, especially water or the atmosphere
  6. 9. decayed organic material used as a fertilizer for growing plants