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| Question | Answer |
| renewable energy | energy that is replinished over a short period of time. |
| sustainable energy | energy must be renewable with a low enough environmental impact that can be used for long term |
| wind energy | energy contained in the motion of air across earths surface |
| photovoltaic cells | convert solar cells directly into electricity |
| active solar technologies | directing solar energy to energy |
| solar thermal systems | another active technology that captures solar energy for heating |
| passive solar technologies | the capture of electricity without electrical or mechanical assistance |
| geothermal energy | heat stored underground in rocks |
| geothermal heat pumps | activily moves heat from underground to the house or removes it to cool it down |
| payback time | the amount of time it would take to save enough money in operation costs to pay for eqipment |
| geothermal power plants | power plants that use the heat of hydrothermal reservoirs to produce steam adn turn turbines to generate electricoty |
| hydropower | energy produced through running water |
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