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← GeographyWhich 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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