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← GeographyWhat wave action gradually causes toppling of coastal sea stacks?
A)Hydraulic action exceeding structural integrity✓
B)Salt crystal growth weakens stratum
C)Differential thermal expansion fractures surface
D)Dissolution of carbonate rock accelerates erosion
💡 Explanation
Hydraulic action creates pressure within cracks of the sea stack, fracturing the rock and weakening its structure; consequently, wave impact exceeds the stack’s structural integrity, therefore toppling occurs, rather than simple abrasion because rapid fracturing drives instability.
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