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← GeographyWhich outcome occurs when glacial headwall freeze cracks within a cirque?
A)Cirque expansion through headwall sapping✓
B)Isostatic rebound increasing valley elevation
C)Formation of mineral-rich hydrothermal vents
D)Accelerated chemical weathering feldspar grains
💡 Explanation
Cirque expansion proceeds due to the bergschrund repeatedly freezing and thawing, causing headwall sapping because freeze-thaw cycles exploit weaknesses and crack the rock via frost wedging. Therefore, the cirque expands rather than causing isostatic rebound or hydrothermal vent formation, which involve other geomorphic processes.
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