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Geography

Which outcome rapidly alters local albedo when extensive effusive volcanism occurs subglacially?

A)Increased glacial ice accumulation rates
B)Formation of a large jokulhaup
C)Enhanced ablation by geothermal heating
D)Deposition of tephra on glaciers

💡 Explanation

Tephra deposition on glaciers darkens the ice surface, which causes warming because surface albedo decreases, enhancing solar energy absorption; therefore, accelerating melting rather than ice accumulation. This leads to enhanced ablation; geothermal heating alone requires longer timescales, rather than rapid alteration.

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