Q32 of 75 Page 438

The two forms of oxygen found in the atmosphere are:

Combined form of oxygen is present in the form of O2 while other form which is unstable is present in the form of ozone O3.

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30

What would happen, if all the oxygen present in the environment is converted to ozone?

 31

One of the following factors does not lead to soil formation in nature:

 33

Which step is not involved in the carbon cycle?

 34

‘Ozone’-hole means: