1. Where does geothermal energy come from?

2. What does it mean when we say that geothermal energy is 'sustainable'?

3. What method of using geothermal energy involves piping steam from a mile or more in the Earth directly to a generator?

4. What method of using geothermal energy involves moving water between 10 and 20 feet deep in the Earth to cool or heat the water?

5. Which of the following methods are considered a way of harnessing geothermal energy?

6. What ancient civilization used hot springs to heat their floors and public baths?

7. What is the main disadvantage to building geothermal energy plants?

8. What potential environmental issue can occur when building a geothermal energy plant?

9. What country is the largest producer of geothermal energy?

10. What natural disaster could be potentially caused by geothermal power plants?