Some previously called a half-value thickness or half-value layer a half-thickness. Whatever an investigator calls it, the half-value layer is the thickness a layer of a given material would have to be to reduce the intensity of radiation striking its surface by half (50%).
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Ozone layer is a layer having only one layer of gas. That layer of gas is ozone layer.
A layer in atmosphere is at risk. The layer is ozone layer.
The layer below the earth's outer layer is mesosphere. It is the 3rd layer.
The ozone layer is located in the stratosphere, which is the second layer of Earth's atmosphere above the troposphere.
The ozone layer is in the stratosphere. It is one of the layer of atmosphere.