Human Impacts on Earth's Systems

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Across
  1. 4. a natural substance made from one or more minerals
  2. 7. a naturally occurring, non living substance
  3. 9. the protection and care of forests, rivers, and other natural resources
  4. 10. able to produce the effect wanted without wasting time or energy
  5. 11. a material supplied by nature that is used by humans and other organisms
  6. 12. a change that happens because of some kind of action
  7. 13. material made by nature at least as quickly as people use it
Down
  1. 1. a resource that is replenished at a slower rate than it is used
  2. 2. the presence of harmful substance in the environment
  3. 3. energy produced by moving water
  4. 5. to organize into groups based on a system
  5. 6. to change in form
  6. 8. a mixture of methane and other gases formed underground and used for energy