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Which comparative statement is most correct about development of Earth's internal layers and external spheres?

Answer and explanation

Correct answer: Internal layers formed by differentiation and external spheres evolved through gas water and biological processes

The governing concept is that different parts of Earth formed through different but connected processes. During differentiation, the young planet heated and partially melted, allowing dense materials such as iron to move inward while lighter silicate materials formed the mantle and crust. The external spheres developed later through cooling, volcanic gas release, condensation and biological activity: these processes produced the atmosphere, hydrosphere and biosphere and altered the surface. Therefore, option A is correct. Options B, C and D use one-factor explanations that cannot account for both internal layering and the later development of all external spheres.

Related tags

DifferentiationEarth SpheresPlanetary EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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