Sparsely joined Portland limestone is the most resistant rock along the Purbeck Coast. However wave action exploits weak points forming caves, which eventually become arches as the sea breaches through the rock. A number of processes contribute to this, including:
Hydraulic action � a process in which the pounding waves compresses trapped air within cracks and fissures creating high pressure fractures
Abrasion or corrasion � when stones and other debris are smashed against the shore battering the rock surface, and
Corrosion � which sees Limestones other rocks react chemically with the sea water and break down into smaller pieces
Added:
9th Dec 2005 by Diane Earl
Subjects:
Geography, Science
Key Stages:
Key Stage 1, Key Stage 2, Key Stage 3, Key Stage 4, Key Stage 4+
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Picture 1 of 15 - Stair Hole & Lulworth � Cove development
