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Which mechanism explains ice lens formation under roads?

A)Cryosuction draws water towards freezing front
B)Osmosis concentrates salts at soil surface
C)Capillary action prevents localized ground freezing
D)Thermal expansion reduces granular soil porosity

💡 Explanation

Cryosuction explains ice lens formation because a temperature gradient generates suction pressure, drawing water vapor to a cold front in susceptible soils; therefore ice accumulates, rather than simply freezing randomly due to nucleation alone in the aggregate material.

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