The Exosphere is the coolest part of the atmosphere. I'm pretty sure this is the right answer.
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The mesosphere is the layer of the atmosphere that is considered the coolest, with temperatures decreasing as altitude increases. It ranges from about 31 miles to 53 miles above the Earth's surface.
The coolest layer of the Earth is the lithosphere, which is the rigid outermost layer consisting of the crust and upper mantle. This layer's temperature decreases with depth, making it the coolest part of the Earth's structure.
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 UV rays must pass through atmosphere. So the layer must be in Atmosphere. The layer of the atmosphere is he ozone layer.
The last layer of the Earth's atmosphere is the exosphere. This layer is the outermost layer of the atmosphere and extends beyond the thermosphere. The exosphere is where the atmosphere gradually transitions into outer space.