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← GeographyWhich mechanism causes inward rock fracturing within cirques?
A)Frost wedging during freeze-thaw cycles✓
B)Chemical weathering via aeolian deposition
C)Sheeting from pressure release unloading
D)Hydrolysis weakens feldspar crystal bonds
💡 Explanation
Glacial headwalls experience intense freeze-thaw cycles in saturated cracks, causing growth of ice crystals thus **frost wedging**. Repeated cycles widen fractures, rather than hydrolysis, because water accessibility limits chemical weathering effectiveness.
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