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Why can landslide risk increase in hilly regions during monsoon?

Answer and explanation

Correct answer: Heavy rainfall can make slope soil and rocks unstable

The direct answer is A: heavy rainfall can make slope soil and rocks unstable. A slope is held partly by friction and the strength of soil and rock. During intense or continuous rain, water enters the ground and fills spaces between particles. The soil becomes heavier and may lose friction and strength; water can also increase pressure inside the slope. If the resisting strength becomes less than the force pulling material downhill, soil and rocks may slide. Therefore landslide risk rises, especially where slopes are steep, vegetation has been removed, or roads and construction disturb the land. Option A gives this correct cause. Option B is wrong because rain does not always strengthen mountains; saturation can weaken slopes. Option C is wrong because hills can receive heavy monsoon rain. Option D is wrong because clouds cannot turn rocks into metal. Memory cue: steep slope plus saturated, weakened ground means greater landslide risk.

Related tags

ClimateMonsoonLandslides

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