Natural Resources

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Across
  1. 4. A source of energy made from the remains of ancient, once-living things
  2. 5. A useful source of energy that is replaced quickly in nature
  3. 7. Any harmful substance that affects Earth’s land, air, or water
  4. 8. Something that is found in nature and is valuable to humans
  5. 9. Energy obtained from Earth’s interior
  6. 10. Electricity produced by waterpower
Down
  1. 1. A source of energy other than the burning of fossil fuel
  2. 2. A natural material or source of energy that is useful to people and cannot be replaced easily
  3. 3. Type of fuel made from biomass, or living or formerly living material
  4. 6. Power obtained from solar energy to generate electricity using solar cells