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Development of the ozone layer was mainly linked with the availability of which gas?

Answer and explanation

Correct answer: Oxygen

The direct answer is D, oxygen. The ozone layer is made mainly of ozone, which contains three oxygen atoms. First, early Earth had very little free oxygen. Photosynthetic organisms later released oxygen into the atmosphere. Sunlight split some oxygen molecules, and the oxygen atoms joined other oxygen molecules to form ozone. Ozone then collected in the upper atmosphere and absorbed harmful ultraviolet radiation. A, helium, is a light noble gas and does not form ozone. B, methane, is a carbon compound and is not the main raw material for ozone. C, ammonia contains nitrogen and hydrogen and is not the required gas. D is correct because rising atmospheric oxygen made ozone formation possible. Memory cue: more free oxygen means the possibility of an ozone shield.

Related tags

Ozone LayerOxygenAtmospheric Evolution

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