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Atmosphere

TermDefinition
Air Pressure The measure of the force which air molecules push on a surface.
Atmosphere A mixture of gases that surrounds a planet or moon.
Altitude The height of an object or point in relation to sea level or ground level.
Troposphere The lowest layer of the atmosphere, in which temperature decreases at a constant rate as altitude increases.
Stratosphere The layer of the atmosphere that is above the troposphere in which temperature increases as altitude increases.
Mesosphere The layer of the atmosphere between the stratosphere and the thermosphere and in which temperature decreases as altitude increases.
Thermosphere The uppermost layer of the atmosphere, in which temperature increases as altitude increases.
Ionosphere The layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 50 to 600 miles (80 to 1,000 km) above the earth's surface.
Ozone Layer Altitude of about 6.2 miles (10 km) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
Greenhouse Effect The trapping of the sun's warmth in a planet's lower atmosphere due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
Radiation The transfer of energy as electromagnetic waves.
Conduction The transfer of energy as heat through a material
Convection The movement of matter due to differences in density; the transfer of energy due to the movement of matter.
Global Warming A gradual increase in average global temperature.
Created by: Annette.passmore