Across
- 3. yellowish-black liquid found in geological formations
- 6. the use of falling or fast-running water to produce electricity or to power machines
- 7. the long-term heating of Earth's climate over the past 100 years
- 8. energy from the sun used for electric energy
Down
- 1. moving air
- 2. relating to or produced by the internal heat of the Sun
- 4. a black rock used for heating and is a fossil fuel it is also a nonrenewable resource
- 5. carbon dioxide,methane, nitrous oxide, and water vapor