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The '''thermosphere''' is the layer of the [[Earth]]'s [[atmosphere]] directly above the [[mesosphere]] and directly below the [[exosphere]]. Within this layer, [[ultraviolet]] [[radiation]] causes [[ionization]]. (see also: [[ionosphere]])
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http://en.wikipedia.org/wiki/Thermosphere
 
 
The '''thermosphere''', named from the Greek θερμός (thermos) for heat, begins about 85 [[km]] above the Earth. At these high [[altitudes]], the residual atmospheric [[gas|gases]] sort into strata according to [[molecular mass]] (see [[turbosphere]]). Thermospheric [[temperature|temperatures]] increase with altitude due to absorption of highly energetic solar radiation by the small amount of residual [[oxygen]] still present. Temperatures are highly dependent on [[solar activity]], and can rise to 2,000°C. Radiation causes the air [[particles]] in this layer to become electrically charged, enabling [[radio]] waves to bounce off and be received beyond the [[horizon]]. At the exosphere, beginning at 500 to 1,000km above the Earth's surface, the atmosphere blends into [[space]]. The few particles of gas here can reach 2,500°C (4500°F) during the day.
 
 
 
 
 
[[Category: Articles]]
 
 
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