What is the Definition of Atmosphere?
layer of gases surrounding earth and held there by gravity. Nitrogen forms 78.09% by volume and Oxygen 20.95%. The remaining 0.96% is made up of a further 19 gases. The boundary of the atmosphere is 1000km above sea level but 99% of the gases are held in the lower 40km. This is split into three layers. the troposphere and the stratosphere separated by the tropopause. Carbon dioxide in the troposphere allows photosynthesis and also holds long-wave radiation to give warmth. Temperatures fall with altitude at a rate of approximately 6.5°C per km to the tropopause where they are stable. Ozone in the stratosphere traps ultraviolet radiation and leads to an increase in temperature in this layer.
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Label: Geography
Theme: Dictionary of Geography Terms
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What is the Definition of Atmosphere in Geographic Terms?
You can find other random definition and meaning of geographic terms below:
What is the meaning of Terrace
An elevated surface above the existing level of a floodplain or shore that is created by stream or ocean wave erosion.
What is the meaning of Terminus
End or snout of a glacier.
What is the meaning of Texture
The relative quantities of the different types and sizes of mineral particles in a deposit of sediment. Also see the related soil texture.
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