Humans and Environment

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Across
  1. 2. A material that can be used
  2. 7. Taking more than the environment to restore
  3. 9. People killing more animals than nature can keep up with
  4. 11. Humans cutting down trees
  5. 12. A state that can be maintained forever
  6. 14. Process plants do to convert carbon dioxide and sunlight into glucose
  7. 15. A substance in the environment that does not belong there, that is harmful
  8. 16. Chemical substance that enhances the speed of growth of crops
  9. 17. A biological community that works together to maintain itself
  10. 19. Acidic precipitation caused by greenhouse gases
  11. 20. Environment is rich in nutrients allowing it to increase algae and plant growth
Down
  1. 1. Gases that contribute to the pollution of the atmosphere and cause global warming
  2. 3. Molecule that contains carbon and covalently bonded with hydrogen
  3. 4. Positive Growth
  4. 5. Change in the earth climate
  5. 6. A species that was brought to an environment by people
  6. 8. Synonym for habitat
  7. 10. General term for resources found in the environment that can be used for combustion
  8. 13. A species that naturally occurs in an environment
  9. 18. Things that absorb carbon emissions such as trees or the ocean