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it is the ozone layer in the atmosphere because it is what keeps the atmosphere in check of what is happening in the atmosphere.
It is a good thing for the ozone to be in the upper atmosphere. It is due to the fact that ozone in upper atmosphere forms the ozone layer.
earth's upper atmosphere.
The upper atmosphere is also known as the stratosphere.
The gas that can block ultra-violet radiation in the stratosphere (a.k.a. upper atmosphere) is ozone.