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← GeographyWhich outcome happens because hydraulic head difference increases?
A)Glacier basal sliding accelerates notably✓
B)Chemical weathering weakens rock faster
C)Sublimation rate decreases significantly quicker
D)Vegetation density sharply declines upstream
💡 Explanation
Faster glacier basal sliding happens because increasing hydraulic head differences enhance regelation at the ice-bed interface. This regelation, a phase change driven mechanism, decreases friction along the bed therefore basal sliding accelerates notably, rather than weathering, sublimation, or vegetation changes being the primary outcome.
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