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What change occurred on Earth's surface after ozone layer formed due to oxygen accumulation?

Answer and explanation

Correct answer: Effect of harmful radiation decreased

The governing process is atmospheric evolution. As oxygen accumulated, some oxygen molecules were converted into ozone in the upper atmosphere, forming an ozone layer. Ozone absorbs much of the Sun’s harmful ultraviolet radiation, so the amount and intensity of ultraviolet radiation reaching Earth’s surface decreased. This made surface environments safer and more suitable for the development and survival of life, particularly life outside water. The formation of ozone did not remove gravity, turn all oceans into vapour, or melt the crust. Option A therefore describes the genuine environmental consequence, while the other choices contradict basic planetary processes.

Related tags

Ozone-LayerUltraviolet-RadiationEvolution-Of-LifeEarth-EvolutionGeographyClass 11 McqEvolution Of The EarthThe Origin And Evolution Of The Earth

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