Erosional Landforms

• Headlands and bays are formed because of the geology along the coast. Foreland Headland was formed because it is made up chalk, a hard, more resistant rock and slow to erode through hydraulic action and abrasion. Swanage bay was formed between two headlands because it is where soft, less resistant rock such as clay, has eroded easily, leaving the harder more resistant rock jutting out forming headlands such as Foreland Headland
• Old Harry was formed where an arch at the end of the headland has collapsed to form a stack. A headland was formed where the harder, more resistant rock was left exposed as the softer rock next to it eroded more quickly. The hard limestone headland slowly eroded over time. 


  Firstly hydraulic action created a crack in the headland. Through further hydraulic action and abrasion the crack grew into a cave which became larger over time. Eventually the cave developed into an arch which was gradually broken down by mechanical, chemical and biological weather. The arch then collapsed
• Formation of stump

  
• Lulworth Cove was formed where a weakness in the hard limestone rock was slowly eroded by the sea through hydraulic action and abrasion. When the sea broke through the limestone, it was able to erode the clay. Through hydraulic action and abrasion this softer and less resistant rock eroded more quickly, forming the cove. Chalk is harder than clay, but softer than limestone, so cliffs are formed at the back of the cove.