| A | B |
|---|
| where does geothermal heat come from | interior of the earth |
| name for cells that collect and convert sunlight into electricity | photovoltaic |
| name some advantages of Alternative Energy | Renewable, No fuel needed, little pollution |
| disadvantages of Alternative Energy | Cost, not usable everywhere, disrupt ecosystem |
| name 4 types of alternative energy | water, wind, solar energy, geothermal, biomass |
| name for electricity generated by moving water | hydroelectric |
| how much of the US uses hydroelectricity | between 8 - 12% |
| on what river is the Hoover Dam located | Colorado River |
| what country has a plant that harnesses the power of the tides | France |
| what factors determine the amount of power generated by the wind | wind speed, diameter of windmill blades, efficiency of the windmill |
| what does a passive solar heating system do | collects and stores heat |
| what does an active solar heating system do | collects, stores, and distributes heat |
| what are some drawbacks of biomass as a source of energy | not efficient fuel, expensive to store and ship |
| what was the main source of energy 100 years ago | wood |
