Across
- 3. Is a liquid fuel produced by biomass
- 4. Is energy produced by heat from Earth's interior
- 6. Renewable because the water cycle is driven by the sun
- 7. From Earth comes from two sources, nuclear fusion and radioactive elemental decay
Down
- 1. Warms earth
- 2. Is renewable because the wind will blow as long as the sun warms earth
- 3. Natural resource used to generate electricity and other forms of energy
- 5. Is organic matter from plants and from animal waste that contains chemical energy