3. Mesosphere (mesosphere).
It is the middle layer of the atmosphere from the stratosphere to the fourth floor and a further 40 kilometers to the floor with very little ozone. The temperature is decreased When moving up to find molecules. Gas in the form of ions, such as O2, NO + in the atmosphere, the temperature will drop below the -100 oC at an altitude of 90 kilometers from the surface. Temperatures will remain in this area that the mesopause, which is the boundary between this layer and the next layer.
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