Across
- 5. energy derived from sources that will run out and will not be replanished for several lifetimes
- 6. energy in a transformed state
- 7. flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground and used as fuel.
- 9. a solid combustible material made of carbon and formed from organic matter due to heat and pressure
- 10. energy forms that can be used directly as they appear in nature
- 11. small nuclei of two elements collide and fuse and release energy
- 12. fossil fuels, coal, natural gas, oil.
- 13. also called crude oil, is a fossil fuel.
Down
- 1. an energy source that can be easily replanished
- 2. made from decomposing plants and animals, found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy.
- 3. solar energy, wind turbines, hydroelectric power.
- 4. the ability to work
- 8. oxygen, water and pyrate from underground mines react and form sulfuric acid that lays on bodies of water