QUESTION1. Which of the following substances is commonly used in a geothermal system?
Isobutane
Hydrogen sulfide
Radioactive waste
Liquid nitrogen

QUESTION 2. Hydropower pollutes the water it uses for energy.
True
False

QUESTION 3. Which of the following statements is true of an enhanced geothermal system?
It needs very hot water to work.
It is also known as a "hot dry rock" system.
It is an open-loop system.
It is built directly over hot spots.

QUESTION 4. How much water does a geothermal plant use for every megawatt hour produced?
None
50 gallons
4,000 gallons
10,000 gallons

QUESTION 5. Geothermal energy needs water to work.
True
False

QUESTION 6. What city was created by the construction of the Hoover Dam?
Boulder City
Boulder Canyon
St. Thomas
Grand Coulee

QUESTION 7. How many homes will enhanced geothermal systems be able to power by 2050?
1,400
150,000
7 million
250 million

QUESTION 8. Hydropower alone can supply the world's electricity needs.
True
False

QUESTION 9. Which of the following statements is true of a binary cycle system?
It works best if with water above 400°F.
It works only with open-loop systems.
It works best with water below 400°F.
It is still experimental.

QUESTION 10. Which of the following statements is true of water used for geothermal systems?
It flows over a turbine.
It sometimes contains contaminants.
It is the same ground water used by the surrounding community.
It causes acid rain.

QUESTION 11. What is the average temperature of magma?
500°F
2000°F
5000°F
10,000°F

QUESTION 12. How many years did the Hoover Dam close to tourists after the German plot to bomb it in 1939?
1
6
8
12

QUESTION 13. Hydropower is cheaper than coal-powered plants because hydropower has achieved economies of scale.

True
False

QUESTION 14. In a hydroelectric power plant, where is the water stored before being released to power a turbine?
In the intake
In the powerhouse
In the penstock
In the water reservoir

QUESTION 15. Some geothermal power plants cause acid rain.
True
False