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Which major explanation fails if the sequence of lithosphere and hydrosphere is reversed?

Answer and explanation

Correct answer: Permanent accumulation of rainwater after the formation of a cool, solid surface

A permanent hydrosphere required Earth to cool enough for a solid lithosphere to form. Water vapour could then condense as rain and collect in surface depressions to form oceans. If the hydrosphere is placed before the lithosphere, the explanation for the stable accumulation of water and formation of oceans breaks down. Solar-wind loss of gases, photosynthetic oxygenation, and the giant-impact hypothesis concern different processes. Exam tip: remember the sequence—cooling and solid crust/lithosphere first, followed by stable water bodies.

Related tags

Earth EvolutionLithosphereHydrosphereEarly EarthFormation Of OceansPhysical GeographyEvolution Of The EarthThe Origin And Evolution Of The Earth

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