See "It is true that life could not have existed on land until the ozone layer formed about 2 million years ago Why does life on land require an ozone layer?" in the "Related questions" section below.
Ozone formation was a natural process. It is a chemical process. When oxygen is treated with UV radiations oxygen gets converted into ozone.
The ozone was formed far ago. As the first UV touched oxygen, ozone was formed.
The ozone layer is formed in stratosphere. It is mainly present there.
Ozone developed with the development of oxygen. It was converted to ozone by UV.
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Ozone layer contains ozone in it. Therefore, it is named so.
Earth has a layer of ozone. It is present as the ozone layer.
Ozone is a layer which protects us. Actually ozone is just a gas, ozone layer is the layer.
Earth and Venus have a protective ozone layer. These planets have ozone molecules in ozone layer.
you stupid for not knwoing
UV rays were the one's that hindered complex organisms. With the ozone layer, these rays were absorbed.
Ozone layer contains ozone in it. Therefore, it is named so.
Ozone layer is formed of ozone. It is a gas.
Earth has a layer of ozone. It is present as the ozone layer.
damage to ozone layer is called ozone depletion. It is thinning of ozone layer.
Ozone is a layer which protects us. Actually ozone is just a gas, ozone layer is the layer.
The layer of gases that surround the atmosphere is ozone. It is present as the ozone layer.
Ozone layer is the layer of ozone. Humans are altering it by CFC's.
The ozone layer is in the stratosphere. It is a pool of ozone molecules.
Earth and Venus have a protective ozone layer. These planets have ozone molecules in ozone layer.
the ozone layer is the the part of the atmosphere that screens out harmful radiation from the sun.