Across
- 4. the process of obtaining coal or minerals
- 8. resources that cannot be replaced
- 12. the total amount of water on the earth
- 16. living part of earth
- 17. has blades and spins in wind, water, or steam
Down
- 1. uses the natural flow of moving water for electricity
- 2. the movement of air
- 3. isn’t changed by the other variables
- 5. the solid part of the earth
- 6. able to be replaced by natural cycles
- 7. changes as a result
- 9. community of living organisms
- 10. material to produce power by burning
- 11. the presence of frozen water
- 13. process involving heating
- 14. organic material that comes from plants and animals
- 15. converts mechanical energy into electrical energy