Near coastal cliffs, which outcome occurs when wave height increases significantly, exceeding the rock's cohesive limit?

💡 Explanation

Increased wave height drives hydraulic action, a form of erosion, because increased pressure weakens the cliff structure, therefore cliff retreat accelerates, rather than building depositional features or reducing sediment movement which depends on different flow regimes.

• Which mechanism causes relatively shallow sill depths at the mouth of many fjords?
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