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← GeographyWhich outcome results when a glacier surge obstructs a subglacial lake's outlet?
A)Increased hydrostatic pressure causes jökulhlaup.✓
B)Reduced sediment load alters floodplains.
C)Decreased albedo triggers accelerated melting.
D)Elevated turbidity diminishes sunlight penetration.
💡 Explanation
Lake blockage increases hydrostatic pressure upstream; therefore a glacial outburst flood (jökulhlaup) occurs because water suddenly breaches the blockage. Rather than changing sediment, melt rate or light because blocked currents build pressure.
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