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If radioactive heat is ignored, which explanation of Earth’s evolution becomes weak?

Answer and explanation

Correct answer: Long-lasting internal activity and volcanism

Option A is correct because radioactive decay inside Earth has been an important long-term source of internal heat. Isotopes such as uranium, thorium, and potassium release energy as they decay, helping maintain elevated temperatures within the mantle and supporting convection over geological time. This heat contributes to melting, magma generation, volcanism, and other internal geological activity, although it is not the only heat source. Ignoring it would therefore weaken an explanation of why Earth remained internally active for billions of years. Photosynthesis, ozone’s protective role, and gas dissolution in seawater involve biological or atmospheric processes and are not the direct consequence being tested here.

Related tags

Radioactive-HeatInternal-HeatVolcanismEarth-EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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