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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 Earth's atmosphere ;0-17 km |
| stratosphere | Above Earth's surface, sites of weather, organisms, contains most atmospheric water vapor |
| Thermosphere | Second layer of atmosphere; Extends from 10 to 30 miles up; Location of ozone layer; Absorbs 95% of ultraviolet radiation |
| Exosphere | the outer layer of the thermosphere, extending outward into space. |
| Atmospheric gass | nitrogen makes up 78%, 21% oxygen, and remaining 1% is carbon dioxide, water vapor and other gasses |
| Nitrogen (N2) | most abundant gas in the atmosphere (78%) |
| oxygen (O2) | gas that makes up 21% of the air in 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 | gasses such as hydrogen, helium, carbon dioxide and argon that exist in verysmall quantities in the atmosphere; gases that make up less than 1% of Earth's atmosphere |
| Water vapor | water in the form of a 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 | gasses in Earth's atmosphere that trap heat near the surface |
| Water cycle | the continuous process by which water moves from Earth's surface to the atmosphere and back |
| Evaporation | the change of a substance from a liquid to a gas |
| Condensation | the change from a gas to a liquid |
| Precipitation | any form of water that falls from clouds and reaches Earth's 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 Earth’s surface |
| Dew | water that has condensed on a cool surface overnight from water vapor in the air |
| Frost | ice formed when water vapor changes directly into ice crystals |
| Ozone (03) | part of Earth's upper atmosphere; it protects people by absorbing harmful rays from the sun. |
| Greenhouse effect | a warming of Earth's surface and the air above it. It is caused by gasses in the air that trap energy from the Sun |
| mesosphere | middle layer of the atmosphere; 51-85 km above Earth’s surface; coldest layer,this is where meteors burn up |
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