Across
- 3. Living things within the ecosystem.
- 4. Energy from the sun is converted into thermal and electric energy.
- 7. Energy from natural resources.
- 11. the ability to maintain or support a process continuously over time
- 13. Oldest and largest source of renewable energy.
Down
- 1. Sources that will not run out.
- 2. the inputs we use to produce goods and services
- 5. Heat within the earth.
- 6. Raw materials used from the earth.
- 8. A form of renewable energy that uses power from the wind.
- 9. A term for non-renewable energy such as coal.
- 10. Limited in size.
- 12. Non-living things within the ecosystem.