Across
- 3. Burns more clear than other fossil fuels.
- 7. Energy that can't be produced.
- 9. Rock oil.
- 10. Renewable energy that comes from the wind. This form can't run out.
- 11. Energy that can be produced.
- 12. Acid rain forms when the gases used to make energy combine with the air. This harms plants and animals.
Down
- 1. Renewable energy from the sun.
- 2. Nonrenewable energy that uses minerals in Earth's crust. It spits nuclei.
- 4. Sedimentary rock formed from the remains of dead plants. This can be used for energy.
- 5. Energy from the water.
- 6. Extracted from heat and stored within the earth.
- 8. biomass includes living or recently dead organic material that can be used as fuel.