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How do waves shape our coastline?

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Presentation on theme: "How do waves shape our coastline?"— Presentation transcript:

1 How do waves shape our coastline?
Coastal Erosion: Hydraulic Action, Abrasion, Solution, Attrition? The hurling of rocks at the cliff face. This is like a sandpaper action. Acidic sea water dissolves any minerals in the cliff face. Rocks hit against each other in the wave to leave smooth, rounded pebbles. Waves hit or break against a cliff face compressing air into small cracks. As the wave retreats, the build up of pressure is released with explosive force.

2 Cliff & Wave Cut Platform

3 Wave-cut platform The waves attack the base of the cliff through the processes of abrasion, corrosion, hydraulic action and attrition. Over time the cliff will be undercut and a wave-cut notch is formed. Eventually the cliff becomes unstable and collapses. Further cliff retreat will form a wave-cut platform.

4 Kimmeridge Bay Wave cut notch = an indentation at the base of a cliff formed by waves undercutting the cliff. This forms a wave-cut notch. Wave cut platform = a long, flat, rocky platform left behind at the base of the cliff as the cliff retreats. Found between LWM and HWM Cliffs and wave-cut platforms tend to be produced together. Destructive waves attack the bottom of the rock face between the high and low tide levels. The rock above overhangs and eventually collapses, producing a steep cliff. As this continues the cliff moves further and further backwards creating a wave-cut platform where the cliff once was. Cliff = vertical or steeply sloping rocks

5 Show video

6 Headland and Bay Order the statements below to explain the formation of Bays and Headlands. Draw at least 2 LABELED diagrams to illustrate their formation. The hard rock resists erosion and form headlands. A headland projects out into the sea and have a cliff either side. A bay is a semi circular shape of sea extending into the land. The soft rocks are more easily eroded than the hard rocks. Form on coastlines with alternate hard and soft rocks. The soft rocks are eroded more quickly to form bays.


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