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2. 97% of Earth's water is in the ____________.
4. Underground caves that collapse create ___________ at the surface above them.
7. Wood, animal waste, and peat are all examples of ____________ energy.
8. Petroleum, coal, and natural gas are all examples of _________________.
10. The area of land where all the water/runoff flows to a particular river is called a __________.
11. One of the three main uses for energy resources is ________.
12. Resources that cannot be replaced once they are used are called ______________ resources.
14. Rivers, streams, lakes, swamps, and marshes are all types of _________ water.
17. ____________ refers to the process of managing resources so they are replenished as fast as they are used up.
19. Ethanol and Biodiesel are types of __________.
20. One of the three main uses of energy resources is _____________.
21. The largest watershed in the United States is the ____________ watershed.
22. Trapping heat from the sun by using specific building materials or techniques is called ___________ solar energy.

1. When dams use the power of moving water to create pollution-free electricity it's called ____________ power.
3. One of the three main uses of energy resources is ________.
5. Rotating crops is a way to save and replenish ________ for future use.
6. Anything we use that occurs in nature is called a(n) ______________.
9. ____________ resources can be replenished and used again.
13. The use of solar panels, or photovoltaic cells, is called ________ solar energy.
15. Man-made lakes are called ____________.
16. Layers under the ground where rocks have enough pore spaces to store/trap a useable amount of water.
18. ___________ energy uses the heat from magma chambers beneath the ground to create electricity.