what is the correct meaning of thermosphere?
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The thermosphere is the layer in the Earth's atmosphere directly above the mesosphere and below the exosphere. ... Taking its name from the Greek θερμός (pronounced thermos) meaning heat, the thermosphere begins at about 80 km (50 mi) above sea level.
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The thermosphere lies in between the two layers known as mesosphere and exosphere. Within this layer of the atmosphere, ultraviolet radiation causes photoionization of molecules which creates ions. It is characterized throughout by an increase in temperature with height.
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