Across
- 3. being able to produce the effect wanted without wasting time or energy.
- 6. are a natural substance made from one or more minerals
- 8. supplies new solar energy every day
- 9. energy that comes from the movement of water
- 10. A nonrenewable resource
- 13. are non-living materials that come from Earth.
- 15. water
- 16. a flammable gas.
Down
- 1. a material supplied by nature that is used by humans and other organisms.
- 2. uses mills to be a renewable resource
- 4. coal
- 5. A nonrenewable resource
- 7. solar
- 8. The original source of most energy that people use
- 11. is a renewable resource because plants constantly produce oxygen
- 12. we use as food are renewable resources
- 13. wind
- 14. A nonrenewable resource