Across
- 2. Production of electricity by water
- 4. Plant based material used as fuel
- 6. Thermal energy in Earth's crust
- 8. Use solar energy that heat a fluid
- 10. Use of the sun's energy for heating
- 11. Wind or solar power
Down
- 1. energy from the ocean
- 3. Reduce the amount of energy used
- 5. Prevention of wasteful use of energy
- 7. Do not deplete natural resources
- 9. Cell producing an electric current