Natural Resources and Human Impacts - 1

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Across
  1. 1. The state that results when something has died out completely
  2. 3. Relating to the natural heat produced inside the Earth
  3. 7. Energy that is created by the splitting of nuclei
  4. 11. Water that is underground
  5. 12. The place where a plant of animal normally lives
  6. 14. Not harmful or less harmful to the environment
  7. 18. The act of producing or sending out something from a source
  8. 19. Something that makes a place or substance no longer suitable for use
  9. 20. Capable of slowly being broken down by natural processes
  10. 21. A kind of species that is non-native to an area and likely to cause harm
Down
  1. 2. Someone who works to protect animals and natural resources
  2. 4. Made or grown without artificial chemicals
  3. 5. The warming of the Earth's atmosphere when solar energy is trapped
  4. 6. Anything occurring naturally that humans use
  5. 8. A system in which materials are buried under the ground
  6. 9. An area composed of marshes or swamps that act as natural filters
  7. 10. A chemical used to destroy unwanted plants
  8. 13. A decayed mixture of plants that is use to improve soil
  9. 15. Able to be restored naturally in a relatively short period of time
  10. 16. Made to be thrown away
  11. 17. A substance that can cause cancer
  12. 22. Fog mixed with smoke