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Which outcome occurs when intense orographic lift acts upon humid air masses moving through narrow mountain stream valleys?

A)Formation of glacial ice dams
B)Increased localized precipitation
C)Enhanced rates of chemical weathering
D)Higher stream sediment concentrations

💡 Explanation

Localized precipitation increases because ascent amplifies adiabatic cooling causing supersaturation, triggering condensation by the seeder-feeder mechanism. Therefore orographic heavy rainfall occurs rather than uniform coastal or leeward effect under ordinary conditions.

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