Across
- 4. naturally occurring chemical elements that are often hard, shiny, and effective heat and electricity conductors
- 5. the process by which the wind is used to generate mechanical power or electricity
- 7. electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves
- 9. a naturally occurring, inorganic solid with a specific chemical makeup and a repeating, orderly internal crystal structure
- 10. flammable gas, consisting largely of methane and other hydrocarbons,
Down
- 1. An energy source formed in the Earth's crust from decayed organic material
- 2. (of a natural resource or source of energy) not depleted when used.
- 3. a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption
- 6. a method used to extract natural gas and oil from deep rock formations known as shale
- 8. a liquid hydrocarbon mixture from ancient organic matter, used as fuel (gasoline, jet fuel) and in products