Across
- 2. renewable energy sources cannot run
- 3. energy from the movement of water
- 6. energy from the sun
- 7. biofuels are made from burning
- 9. solar energy is collected in a
Down
- 1. energy from the heat under the earth's surface
- 4. energy generated from natural resources
- 5. wind spins a
- 8. several wind turbines are called wind
