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← GeographyWhich mechanism causes the highest stream discharge rates in mountainous regions dominated by glacial ice?
A)Orographic precipitation enhancing baseflow
B)Glacial meltwater contribution during summer✓
C)Increased evapotranspiration from warming
D)Reduced infiltration due to permafrost melt
💡 Explanation
When temperatures rise in summer, glacial meltwater increases stream discharge because ice changes phase to liquid, providing substantial water volume directly into rivers. Therefore meltwater dominates, rather than precipitation, evapotranspiration, or permafrost changes which have secondary or opposing effects on streamflow volume.
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