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← GeographyWhich outcome accelerates glacial ice advance when basal debris concentrates?
A)Increased basal sliding velocity✓
B)Decreased serac formation rate
C)Reduced marginal crevassing depth
D)Diminished abrasion of bedrock
💡 Explanation
Increased debris concentration at the glacier's base leads to enhanced basal sliding because Regelation causes meltwater films to facilitate ice movement over uneven surfaces; therefore, forward motion increases, rather than abrasion decreasing which is a different process.
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