Across
- 4. you use too much of it
- 6. of this metal in Bolivia
- 7. buys almost all the petroleum it needs
- 8. originates inside the earth, and it is free
- 11. is used to manufacture aluminum
Down
- 1. when fossil fuels formed
- 2. over the world
- 3. helps to conserve nonrenewable resources
- 5. of "not enough"
- 9. country exports oil
- 10. is the top consumer of petroleum
- 12. energy/originates from the rise and fall of Earth's ocean