| A | B |
|---|
| renewable resources | a resource that is naturally replaced in a relatively short time |
| solar energy | What do we call energy from the sun? |
| It does not cause pollution and it will not run out for billions of years. | What are 2 advantages of solar energy? |
| It is only available when the sun is shining, so a backup energy source is needed on cloudy days & at night. | What is a disadvantage of solar energy? |
| solar plant | rows of mirrors focus sunlight to boil a tank of water creating steam that can be used to generate electricity |
| solar cells | What directly converts solar energy into electricity, but they can only be used to power small items? |
| passive solar system | What converts sunlight into thermal (or heat) energy without using pumps or fans? |
| active solar system | What captures the sun's energy & uses fans & pumps to distribute the heat? |
| true | wind can be used to turn a turbine & generate electricity, true or false? |
| hydroelectric power | What do we call electricity produced by flowing water? |
| biomass fuel | What do we call fuel made from things that once were alive? |
| wood (manure, corn, methane, etc.) | What is an example of a biomass fuel? |
| geothermal energy | heat energy in Earth's interior from water or steam that has been heated by magma |
| hydrogen | What element is very abundant & it can be used as a fuel, but since it is combined with other elements, it takes too much energy to get it? |
| hydroelectric power | What is the most widely used source of renewable energy in the world today? |
