Across
- 6. Releasing harmful materials into the environment.
- 9. The movement of soil by wind or water.
- 10. Coal, oil, and natural gas are examples of this type of energy source.
- 11. Carbon dioxide is an example of this type of gas.
Down
- 1. Oil formed from ancient marine organisms.
- 2. An area of land saturated with water that helps prevent flooding.
- 3. The careful use of resources so future generations can use them.
- 4. A mountain that erupts lava, ash, and gases.
- 5. Energy made from moving water.
- 7. A resource that can naturally be replaced over time.
- 8. Energy from the Sun.