Across
- 3. when burned, all fossil fuels cause -
- 8. coal is a (solid, liquid, or gas)
- 10. It can take millions of years to replace fossil fuels, they are -
- 12. if a resource is renewed by natural processes in a short amount of time, it is -
- 13. energy of motion is called -
- 15. the cleanest burning fossil fuel -
Down
- 1. another word for crude oil
- 2. to pollute
- 4. coal, oil, and natural gas are all -
- 5. fossil fuels are made from dead _____ and animals
- 6. fossil fuels are (inexpensive, expensive)
- 7. one method of extracting natural gas is -
- 9. stored energy is called _____ energy
- 11. oil is a (solid, liquid, or gas)
- 14. natural gas is a (solid, liquid, or gas)