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The effect of tree roots on rocks is an example of which process?

Answer and explanation

Correct answer: Biological weathering

Biological weathering is the breaking down or weakening of rocks by living organisms. Plant roots are an important biological agent. A small root may enter a crack in a rock. As the plant grows, the root becomes thicker and pushes against the sides of the crack. Repeated growth can widen the crack and eventually split the rock into smaller pieces. This action changes the rock physically, even though the cause is a living organism.

Therefore, choice C, biological weathering, is correct. Carbonation is a chemical process in which carbonic acid in water reacts with certain minerals. Oxidation is another chemical process commonly associated with oxygen and minerals, while evaporation is the change of water into vapour and is not a type of rock weathering in this context. The key clue is the action of tree roots, so connect plants and animals with biological weathering.

Related tags

RootsBiological WeatheringGeography

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