Natural resources

123456789
Across
  1. 5. cold
  2. 6. type of energy that gets hot for some reason
  3. 7. Free renewable resource for as long as it is flowing
  4. 8. can be used as an energy resource that otherwise it may be thrown away
  5. 9. Huge Potential
Down
  1. 1. from the sun
  2. 2. something that makes air
  3. 3. to use it again
  4. 4. type of energy that it is caused when you move