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Meteorology
| Term | Definition |
|---|---|
| atmosphere | Mixture of gases which includes 78% nitrogen, 21% oxygen and 1% other gases, |
| troposphere | Lowest part of the atmosphere which contains most of the moisture; where weather occurs. |
| fossil fuels | Coal, oil and natural gas that are burned to generate electricity. |
| stratified | Term used to describe how the atmosphere is divided into layers. |
| ozone | Radiation from the Sun is absorbed by this. |
| photosyntesis | When green plants absorb carbon dioxide and release oxygen. |
| greenhouse gases | Gases like carbon dioxide, methane and water vapor which trap heat close to the surface. |
| chloroflurocarbons | Added by human activities which decrease the amount of ozone. (CFCs) |
| climate | Average weather conditions that prevail each season and year. |
| weather | Conditions in the atmosphere of a location for a short period of time. |
| transpiration | Plants release moisture directly to the air. |
| water cycle | Movement of moisture between the atmosphere, lithosphere and hydrosphere. |
| humidity | Gaseous moisture in the air or invisible water vapor. |
| precipitation | Falling ice crystals or water droplets caused by gravity pulling them down. |
| air pressure | Weight of air pushing down. |
| high pressure | Weather conditions which are cool, dry, clear and calm. |
| low pressure | Weather conditions which are warm, moist, cloudy and unstable. |
| anemometer | Device used to measure wind speed. |
| barometer | Device used to measure air pressure. |
| winds | Horizontal air movements. |
| air mass | Body of air which acquires temperature and humidity from the region it forms in. |
| prevailing winds | Upper air currents which determine movement of air masses. |
| fronts | Boundaries between air masses. |
| hazardous weather | Humans can prepare and protect themselves from this if warnings are given. |
| stratosphere | second part of atmosphere where clouds rarely occur and contains ozone layer. |