All passenger airplanes cruise at the stratosphere.
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A layer in atmosphere is at risk. The layer is ozone layer.
The ozone layer is in the stratosphere. It is one of the layer of atmosphere.
The ozone layer is in the stratosphere. It is one of the layer of atmosphere.
Ozone is concentrated in the ozone layer of the atmosphere. the layer of atmosphere is stratosphere.
The UV rays must pass through atmosphere. So the layer must be in Atmosphere. The layer of the atmosphere is he ozone layer.
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MESOSPHERE is the coldest layer of the atmosphere.
The hottest layer of the atmosphere is the thermosphere.