Which mechanism weakens sea stacks fastest when tides alternate?

💡 Explanation

Hydraulic action breaks rocks as trapped air compresses, because repeated high tide inundation forces water into fissures, thus fracturing the stack; therefore hydraulic action dominates, rather than thermal expansion weathering the material evenly.

• Which mechanism initiates density-driven thermohaline circulation in the North Atlantic Ocean?
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• Which outcome results when pyroclastic flows enter water?
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