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What are the two forms of oxygen found in atmosphere? What is their importance?

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In atmosphere, oxygen is found as
Diatomic molecular form with chemical formula O2 known as oxygen.
Triatomic molecular form with chemical formula O3 known as ozone.
The presence of oxygen in the air (atmosphere) is very essential for the following:
1. The life processes such as respiration, in all living organisms.
2. Combustion of fuels. Otherwise, fire would not have been possible
The presence of ozone in the air (atmosphere) is very essential for the following:
1. Ozone is a gas in the atmosphere that protects everything living on the Earth from harmful ultraviolet (UV) rays from the Sun.

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