20.18: Earth's Energy- Challenge 3

1. In a concentrated solar power plant, sunlight is focused onto a receiver by a group of ___.

mirrors

2. The biggest advantage of solar energy over fossil fuels is that solar power is ___.

renewable

3. Solar energy travels through the empty space between the Sun and the earth via ___.

radiation

4. Water held behind a dam has ___ energy; when the water is released, that energy converts to ___ energy.

potential; kinetic

5. Hydroelectric power is generated when moving water ___.

makes a turbine spin

6. Hydroelectric power generation does not release ___.

pollution

7. Some people oppose the offshore Cape Wind project because they think that windmills are ___.

unattractive

8. One disadvantage of wind power is that ___.

windmills are expensive to build and maintain

9. Wind is always moving and has ___.

kinetic energy

10. Geothermal energy is ___.

pollution free and completely renewable

11. Geothermal power plants generate electricity when ___.

steam from a geothermal well or from water pumped down into the earth spins a turbine

12. Compared to other forms of renewable energy, biomass energy ___.

can be processed into a liquid and used by cars

13. When using a biofuel, the ___ and ___ required to grow that biofuel must be considered.

energy; water/fertilizer

14. Biofuels, such as ___, are added to gasoline to cut down the amount of fossil fuels that are used.

ethanol