UNIT 17: ENVIRONMENT

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Across
  1. 2. Energy sources that are naturally replenished.
  2. 7. Variety of plant and animal life in an ecosystem.
  3. 8. Capable of being decomposed naturally by bacteria or other organisms.
  4. 9. Species at risk of extinction.
  5. 12. Grown without synthetic pesticides or fertilizers.
  6. 13. Gases or substances released into the atmosphere.
  7. 14. Decayed organic material used as fertilizer.
  8. 15. Contamination of air, water, or soil.
Down
  1. 1. The cutting down of forests.
  2. 3. Able to be maintained at a steady level without exhausting resources.
  3. 4. Energy from the sun.
  4. 5. An element released by burning fossil fuels.
  5. 6. A structure that traps heat, often related to global warming.
  6. 10. A natural community of plants and animals.
  7. 11. Protecting Earth's natural resources.