Across
- 1. behavior that uses technology to do the same job using less energy
- 5. one of the largest uses for wood resources
- 6. energy type that can be "quickly" replaced
- 8. the amount of pore space in a material
- 11. process of splitting an atom to produce nuclear energy
- 13. process of removing salt from water to make it drinkable
- 16. type of energy associated with heat
- 17. deposit of mineral that is mined for profit
- 18. behavior that uses less energy
- 20. made from the prehistoric remains of tropical plants
- 21. most of this on Earth is found frozen in ice caps and glaciers
Down
- 1. is a secondary source of energy because it is made from another energy source
- 2. energy sources that include coal, oil, and natural gas
- 3. area of permeable rock or soil that holds large amounts of water
- 4. metallic mineral used for wiring and plumbing
- 7. water and air are considered _______ resources
- 9. type of plate boundary where metallic minerals are often found
- 10. one of the 4 R's of sustainability
- 12. energy of motion
- 14. mineral used for making glass and ceramics
- 15. shape and steepness of the land that determines how soil will form
- 19. major source of protein for people living near water