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Before ozone layer formation what was the most serious environmental barrier for land life?

Answer and explanation

Correct answer: Exposure to intense ultraviolet radiation

The ozone layer absorbs much of the Sun's harmful ultraviolet (UV) radiation. Before it formed, intense UV radiation at the land surface could damage DNA and other biological molecules, making it the major barrier to life on land. Ocean depth was not a barrier to terrestrial life; water could itself provide some protection from UV radiation. Exam tip: link the spread of life onto land with UV protection provided by atmospheric ozone.

Related tags

Ozone LayerUltraviolet RadiationTerrestrial LifeEarth EvolutionAtmosphereClass 11 GeographyEvolution Of The EarthThe Origin And Evolution Of The Earth

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