Natural Resources/Natural Cycles Quiz

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Across
  1. 4. Resources that can be replaced in a reasonable time
  2. 7. The loss of an entire species
  3. 8. the continuous movement of water from the atmosphere to the Earth's surface and back
  4. 11. To process used products into new products
  5. 13. process that animals use to break down food to get energy
  6. 14. The growth of _____________ causes more resources to be used
  7. 15. The careful use of resources so that they last as long as possible
  8. 16. A species with so few individuals that they could die out
  9. 17. gas in the air that has to be fixed into useable forms
Down
  1. 1. materials found in nature that are essential or useful to people
  2. 2. organisms that release carbon dioxide into the air
  3. 3. Bacteria found in the roots of these plants fix nitrogen into useable forms
  4. 5. Resources that cannot be replaced in a human lifetime
  5. 6. To use products again
  6. 9. The gradual long term change of species in an ecosystem
  7. 10. organisms that take in carbon dioxide
  8. 12. the process by which plants make their own food