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Weather part 1 Vocab
| Term | Definition |
|---|---|
| Air pressure | the measure of the force with which air molecules push on a surface |
| Altitude | elevation (height) above sea level |
| Troposphere | lowest layer of earths atmosphere; 0-17 km above earths surface,site of weather,organisms,contains most atmosphere water vapor |
| stratosphere | 2nd layer of the atmosphere ;extends from 10 to 30 miles up;location of ozone layer;absorbs 95% of ultraviolet radiation;temperature increases with altitude increases |
| Thermosphere | the fourth layer of the atmosphere ,in which temperature increases as altitude increases |
| mesosphere | middle layer of the atmosphere ;51-85 km above earths surface ;coldest layer ,this is where meteors burn up |
| exosphere | the outer layer of the thermosphere,extending outward into space |
| atmospheric gases | nitrogen makes up 78%,21% oxygen,and remaining 1% is carbon dioxide,water vapor and other gases |
| nitrogen(N2) | most abundant gas in the atmosphere (78%) |
| oxygen(O2) | gas that makes up (21%) of the air in the earth's atmosphere it passes into the bloodstream at the lungs and travels to all body cells |
| Carbon dioxide(CO2) | a greenhouse gas;a gas that absorbs and radiates heat |
| trace gases | gases such as hydrogen ,helium,carbon dioxide and argon that exists in very small quantities in the atmosphere;gases that make up less than 1% of earths atmosphere |
| water vapor | water in the form of gas |
| fossil fuels | a natural substance formed from the buried remains of ancient organisms that can be used as a source of energy |
| greenhouse gases | gases in earths atmosphere that trap heat near the surface |
| water cycle | the continuous process by which water moves from earths surface to the atmosphere and back |
| evaporation | the change of a substance from a liquid to gas |
| condensation | the change from gas to liquid |
| precipitation | any form of water that falls from clouds and reaches earths surface(rain or snow or hail or sleet or mist ) |
| transpiration | evaporation of water from the leaves of a plant |
| crystallization | the process by which a substance becomes a solid ,sort of like freezing. |
| surface runoff | water that flows over land until it reaches lakes,rivers,or other areas |
| groundwater flow | water that is flowing beneath earths surface |
| dew | water that has condensed on a cool surface overnight from a water vapor in the air |
| frost | ice formed when water vapor changes directly into ice crystals |
| ozone(O3) | part of the earths upper atmosphere ;it protects people by absorbing harmful rays from the sun |
| greenhouse effect | a warming of earths surface and the air above .It is caused by gasses in the air that trap energy from the sun |
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