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A descending convection current can be linked with which process?

Answer and explanation

Correct answer: Subduction or sinking

Direct answer: A, subduction or sinking. In convectional current theory, heated material tends to rise, while cooler and denser material tends to move downward. A descending current therefore represents downward movement or a sinking zone. In plate-tectonic explanations, one plate may sink beneath another at a convergent boundary; this process is called subduction. A is correct because it directly describes downward movement. B, evaporation, is the change of liquid water into vapour caused mainly by heating and is not the meaning of a descending mantle current. C, rainfall, is part of the water cycle and is unrelated to this geological movement. D, river erosion, is the wearing away of land by running water, not the sinking of crustal material. Memory cue: hot rises, cool dense material sinks; sinking plates suggest subduction.

Related tags

Descending CurrentSubductionSinkingConvection TheoryPost Drift Studies And Convectional Current TheoryDistribution Of Oceans And ContinentsGeographyClass 11 Mcq

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