Flashcards
Erosion
Cards in this deck (13)
- 1Hydraulic actionthe force of the river against the banks can cause air to be trapped in cracks and crevices. The pressure weakens the banks and gradually wears it away.
- 2Abrasionrocks carried along by the river wear down the river bed and banks.
- 3Attritionrocks being carried by the river smash together and break into smaller, smoother and rounder particles
- 4Solutionsoluble particles are dissolved into the river
- 5—How did the original headland shape become eroded to the present coastal landscape?
- 61All rocks have lines of weakness. The sea and its waves use hydraulic action, abrasion, attrition and solution to erode along any lines of weakness. Undercutting takes place all around the headland.
- 72These lines of weakness get enlarged and develop into small sea caves
- 83The caves are deepened and widened on both sides of the headland until eventually the sea cuts through the headland, forming an arch.
- 94The rock at the top of the arch becomes unsupported as the arch is enlarged, eventually collapsing to form a stack
- 105The stack gets eroded until only a stump remains.
- 116Over time the stump will disappear
- 127As the headland retreats under this erosion, the gently sloping land at the foot of the retreating cliff is called a wave-cut platform.
- 13—
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- Flashcards on Erosion, created by vicki proctor on 10/05/2016.
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- vicki proctor
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