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What effect occurs on rock when hydration increases the volume of a mineral?

Answer and explanation

Correct answer: Internal pressure and breakage increase

Answer: A, internal pressure and breakage increase. Hydration is a chemical weathering process in which certain minerals absorb water into their structure. The added water can make the mineral swell, so its volume becomes larger. When this swelling occurs inside a solid rock, it produces pressure against neighbouring mineral grains and existing cracks. Repeated wetting and drying, or continued expansion, weakens the rock and may cause splitting or crumbling. B is wrong because swelling does not automatically close every crack; it can enlarge or create cracks. C is wrong because hydration does not turn rock into metal. D is wrong because gravity continues to act on the rock. Memory cue: water added to a mineral may mean swelling, pressure, and eventual breakage.

Related tags

Geomorphic ProcessesWeatheringHydrationChemical WeatheringWeathering: PhysicalChemicalAnd BiologicalWeathering Physical Chemical And BiologicalGeographyClass 11 Mcq

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