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← GeographyWhich mechanism slows stream discharge as permafrost thaws?
A)Decreased evapotranspiration rates
B)Increased hyporheic exchange✓
C)Enhanced channel network density
D)Reduced hillslope runoff generation
💡 Explanation
Increased hyporheic exchange causes greater water transfer from the stream into the subsurface as thaw increases soil permeability; therefore stream discharge slows down because water is diverted into subsurface flows, rather than only from direct surface inputs.
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