Across
- 1. The cleanest fossil fuel, its mostly methane
- 4. As the world becomes more industrialized, the need for energy
- 6. Energy sources that can be replenished naturally.
- 8. Commonly used as fuel in the forms of charcoal and fire
- 9. Resources of energy are found all over the world
- 10. Can be recovered form tar sands
Down
- 1. Energy sources that exist in a fixed amount.
- 2. What fuels consumers can get
- 3. Partially decomposed organic matter burned for fuel
- 5. Take advantage of the different boiling points of fuels
- 7. The most widely used sources of energy.