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Emergent Coasts

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by

Sky Findley

on 23 October 2012

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Transcript of Emergent Coasts

Katie,Molly and Sky Emerging Coastlines Emergent Coastlines Emergent coastlines are expanses of coastline that have been exposed due to falling sea levels. These are controlled by Isostatic uplift. Isostatic Uplift It is a local and relative change in sea levels controlled by the crusts response to the movement of ice. Raised Beaches
An example of a raised beach is Portland in Dorset, in the South-East of England. Relict Cliffs Coastal Plains A Coastal Plain is a large expanse of flat land that lays next to a coastline.

Coastal Plains are often former beaches that have become fertile land since isostatic uplift has created new beaches adjacent to the land.

The Atlantic Coastal Plain stretches from New York Bight to the Eastern Continental Divide. It average elevation is only 900m above sea level A raised beach is an elevated area of a sloping ground, sitting above the present tide line. In the past this area was at sea level. There are many examples of raised beaches in Britain, especially along the West coast as this area experienced the greatest weight of ice during the last Ice Age, which was about 10,000 years ago. Relict cliffs are most commonly found in the North West of Scotland. The definition for relict is something that has survived for example structure or minerals after destructive processes have took place. Relict cliffs in Scotland, were caused due to the last ice age 10,000 years ago. What had happened was the land had become depressed due to the weight of the ice (isostatic). When the ice had melted this had cause isostatic uplift causing regression. During an Ice Age, the weight of the ice on a landmass causes it to sink. As the Earth's temperature begins to rise again the ice melts and the weight decreases causing the land to slowly rise back out of the sea.
This ‘bounce back' motion - the localised change in sea level, relative to the land - is known as isostasy, or isostatic uplift.
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