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When rivers carry fertile soil and dissolved salts from mountains toward plains, which effect of the water cycle does this demonstrate?

Answer and explanation

Correct answer: Nutrient cycling and soil erosion

The correct answer is A: nutrient cycling and soil erosion. Moving water has kinetic energy and can loosen, carry, and deposit soil particles. This process is erosion when soil is removed, transport when the material is moved, and deposition when it settles elsewhere. The transported soil may contain mineral nutrients and dissolved salts, so rivers connect different parts of the landscape and participate in the movement of materials through ecosystems and geological systems. B is too narrow and does not describe the main effect in the example. C is false because water molecules are not destroyed by ordinary river transport. D is unrelated; carrying sediment does not mean that nitrogen fixation completely stops. A useful caution is that transport can enrich some downstream areas but also remove fertile topsoil from the source region.

Related tags

ErosionNutrient CyclingRiver TransportSedimentHydrological CycleThe Living WorldBiologyClass 11 Mcq

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