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Why may weathering be relatively slow in hard rock with few cracks?

Answer and explanation

Correct answer: Pathways for water and air are fewer

Weathering is the breaking down or chemical alteration of rock at or near Earth’s surface. Water, air, dissolved substances, and living organisms usually enter through cracks and act on the rock. A hard rock with very few cracks offers fewer openings for these agents, so weathering may proceed more slowly. Its compact structure also limits the exposed internal surface that can react.

Therefore, option A is correct because fewer pathways allow less water and air to reach the inside of the rock. The other choices do not explain the rate of weathering: gravity is still present, the rock need not be lava, and reflection of sunlight is unrelated. The exact rate can also depend on climate and minerals, but the stated structural reason is valid.

Related tags

Hard RockCracksWeathering Rate

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