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ES Ch. 13
| Term | Definition |
|---|---|
| climate | the average weather conditions in an area over a long period of time |
| latitude | the distance north or south from the equator; expressed in degrees |
| El nino | the warm phase of the El Nino-Southern Oscillation |
| La Nina | the cool phase of the El nino-southern oscillation |
| ozone layer | the layer of the atmosphere at an altitude of 15 to 40 km in which ozone absorbs ultraviolet solar radiation |
| chlorofluorocarbons (CFCs) | hydrocarbons in which some or all of the hydrogen atoms are replaced by chlorine and fluorine |
| ozone hole | a thinning of stratospheric ozone that occurs over the poles during the spring |
| polar stratospheric clouds | a cloud that forms at altitudes of about 21,000 m during the Artic and Antarctic winter or early spring, when air temperatures drop below 80 degrees Celsius |
| greenhouse gases | a gas composed of molecules that absorb and radiate infrared radiation from the sun |
| global warming | a gradual increase in average global temperature |
| Kyoto Protocal | an international treaty according to which developed countries that signed the treaty agree to reduce their emissions of car on dioxide and other gases that may contribute to global warming by 2012 |
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chloeshaver