20.18: Earth's Energy- Challenge 3
- Page ID
- 6098
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- 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