Just as the physical body of the earth is comprised of many layers, the earth's atmosphere is also made up of layers. One of these is called the mesosphere. The literal translation is "middle sphere," as it is sandwiched between the major top and bottom layers of the atmosphere.
The first layer is the troposphere, the second is the stratosphere, the mesosphere is third, then on top of that is the thermosphere and exosphere. The mesosphere begins approximately 30 miles (48.2 km) above the surface of the earth and extends to approximately 50 miles (80.4 km). This "middle sphere" is the layer in the atmosphere in which almost all of the ozone is created.
This happens when ultraviolet radiation breaks up the oxygen in the mesosphere into highly reactive oxygen atoms. These oxygen atoms then bind with oxygen molecules in the mesosphere layer to form ozone. So, the O2 molecules in the mesosphere become two separate O atoms, then they combine with the O2 atoms in the mesosphere to form O3, ... more.
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