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How was the ozone layer created?

A long time ago, plants began to grow on Earth and they released oxygen molecules (02) into the atmosphere, and these oxygen molecules traveled to the stratosphere (the part of the atmosphere above where planes fly where temperature begins to increase with height again). Ultraviolet radiation from the strikes these molecules and splits them into two oxygen atoms (O + O). Then the oxygen atoms combine with an oxygen molecule to make ozone (O + 02 -> 03). Above this layer there are not as many oxygen molecules and below this layer the W radiation cannot reach so the ozone is concentrated at the height of the layer.

Marc Fernau

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