Chapter 5- Human Impacts on Earth's Systems

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Across
  1. 1. a resource that is not made fast enough to replace what is used
  2. 4. a change that happens because of some kind of action
  3. 6. to put into groups
  4. 7. naturally occurring nonliving solids in Earth's crust
  5. 9. natural substances made up of one or more minerals
  6. 10. the presence of substances in the environment that are harmful to humans or other organisms
  7. 11. the energy that comes from the movement of water
  8. 12. the practice of protecting the environment and using resources carefully
  9. 13. changes
Down
  1. 2. a flammable gas
  2. 3. we get as much as we can and do not waste
  3. 5. something found in nature that humans use
  4. 8. a material that is made by nature at least as quickly as people use it