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← GeographyWhich outcome occurs when a cirque glacier experiences increased basal sliding?
A)Increased bergschrund crevasse formation✓
B)Advancement of downstream arêtes
C)Enhanced plucking of the bergschrund
D)Decreased freeze-thaw weathering rates
💡 Explanation
Increased basal sliding enhances bedrock erosion and cirque deepening by regelation, because increased water at the base melts and refreezes around bedrock protrusions promoting fracture; therefore, bergschrund crevasses increase, rather than promoting arêtes or reduced weathering.
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