Across
- 4. uses explosives to blow up entire mountaintops to allow surface mining of coal seams underneath
- 6. moving air provides the force to spin the generator.
- 9. uses energy from the sun
- 10. a ratio that measures the relative cost and difficulty of extracting a specific resource.
- 11. forms of nonrenewable energy that arise from the remains of living organisms
Down
- 1. use running water to spin a turbine and generate electricity.
- 2. energy that is being used quicker than it is being produced
- 3. fossil fuel that is formed from plant matter that has been highly compressed and pressurized
- 5. carbon-rich liquid found within rock strata millions of years old.
- 7. a flammable mixture of gases, including methane (CH4).
- 8. Naturally-occurring heat from the Earth is used in place of fuel.