| A | B |
|---|
| solar energy | energy from the sun |
| hydroelectric power | electricity produced by the kinetic energy of water moving over a waterfall or dam |
| geothermal energy | heat energy in Earth's interior from water or steam that has been heated by magma |
| energy conservation | the practice of reducing energy use |
| pollution | waste products that damage an ecosystem |
| reduce | to cut down on the use of resources |
| reuse | to keep items that can be used again |
| recycle | to recover a resource from an item and use it to make a new item |
| renewable resource | a resource that can be reused |
| non-renewable resource | a resources that cannot be replaced after it is used |
| fossil fuel | a fuel that formed over many years from the remains of living organisms |
| air pollution | the addition of any unwanted substance into the air |
| global warming | an increase in the earth's temperature |
| greenhouse effect | the process by which gases in the atmosphere absorb heat and heep the earth warm |
| wind energy | energy captured from the wind |
| food miles | the distance food travels from its origin to the consumer. |
| ozone layer | a region of the upper atmosphere that absorbs ultraviolet radiation |
| sustainable energy | energy that can be maintained over time |
| tidal energy | energy collected moving water from tides, rivers, and open ocean currents |
| hydrogen fuel | a fuel that can be made by splitting hydrogen atoms from water |
| biomass | burning of carbons such as corn or soy grown to make ethanol fuel |
| carbon footprint | the greenhouse gases emitted directly and indirectly from a source |
| carbon cycle | a complex series of processes in which carbon is exchanged within the earth’s surroundings |
