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If radioactive heat was very low how could the secondary atmosphere process be indirectly affected?

Answer and explanation

Correct answer: Internal activity and volcanic outgassing would weaken

The governing concept is the indirect role of internal heat in atmospheric evolution. Radioactive decay contributes heat to Earth's interior; together with primordial heat, it helps maintain melting, convection and tectonic or volcanic activity. If radioactive heating had been much weaker, internal activity and volcanic outgassing would probably have declined more quickly. Consequently, fewer gases such as water vapour, carbon dioxide and nitrogen would have been released from the interior to build the secondary atmosphere. Option A is therefore correct. Solar-wind speed is controlled mainly by solar processes, while ozone and photosynthesis require later atmospheric and biological conditions and would not automatically appear earlier.

Related tags

Radioactive HeatOutgassingSecondary AtmosphereEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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