GEOGRAPHY: "A hole in the ozone layer" - a clear and brief explanation.

GEOGRAPHY:
What do people mean by 'a hole in the ozone layer?'
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It is called ozone layer depletion. The ozone layer is found in the stratosphere (one of the parts of the atmosphere) and the depletion (the hole) is mostly caused by the activities of man e.g burning which causes the ozone layer to become thin hence the depletion or the hole.
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The ozone layer protects the earth surface and its inhabitants from the ultraviolet rays of the sun.