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What is the main meaning of change in Earth's early gaseous envelope?

Answer and explanation

Correct answer: Gradual evolution of atmosphere

The governing concept is atmospheric evolution. Earth’s early gaseous envelope did not remain unchanged: volcanic outgassing supplied gases, cooling allowed water vapour to condense, and later biological activity altered the composition by adding oxygen and removing some carbon dioxide. Thus, a changing gaseous envelope indicates the gradual development of the atmosphere through physical, chemical, and biological processes. Option A is correct because it states this overall meaning. Option B is unrelated to atmospheric change, since oceans do not become metal. Option C describes neither the atmosphere nor the established evolutionary sequence, and option D is an exaggerated biological claim with no connection to the gaseous envelope. The question asks for the broad process, not one isolated gas.

Related tags

Atmospheric EvolutionGaseous EnvelopeEarth EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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