Across
- 2. a flammable liquid hydrocarbon mixture.
- 6. A natural fuel such as coal, formed in the geological past from the remains of living organisms
- 8. natural resource that has a limited supply
- 9. the start of harmful materials into the environment
- 10. The energy stored in the chemical bonds of a material
Down
- 1. Materials, substances, and organisms found in nature that are useful to humans
- 3. to become a solid mineral.
- 4. naturally occurring, yellowish-black liquid found in geological formations
- 5. a light fuel oil obtained by distilling petroleum, used especially in jet engines and domestic heaters, and lamps
- 7. gas flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground and used as a fuel