Coastlines of emergence and submergence

Created by: steloah1
Created on: 01-05-22 18:03

What is Eustatic change?

A GLOBAL rise in SEA LEVEL resulting in the actual rise or fall in the sea itself. E.g ice ages

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What is isostatic change?

A LOCAL change in sea level resulting from the LAND rising or falling relative to the sea. E.g ice causing the land to sink or rise after a melting period

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Name examples of coastlines of submergence

• Rias (drowned river valleys that have a dendritic system of drainage)
• Fjords (drowned glacial valleys that have a U-shaped valley and are 300 to 400 m deep)
• Dalmatian coasts

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Talk about Fjords

• This is a drowned GLACIAL valley
• As sea levels rise, U-shaped valleys left by glaciers are submerged
• Fjords have steep river valleys and are fairly straight and narrow
• They can be 300-400 meters deep
• Found in Canada, Scotland, and most famous

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Talk about Rias

• A former RIVER valley drowned by rising sea levels
• As sea levels rise, the river valleys are flooded. This means only the high land is visible
• Rias usually have a cross profile typical of a river valley and usually a dendritic system of drainage
•

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Talk about Dalmation coasts

• These form in areas of the world where glacial valleys lie parallel to each other
• When the valleys are flooded, the tops of the valleys remain visible above the sea and appear to be a series of islands that run parallel to the coastline
• Example is D

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Name an example of coastlines of emergence

• Raised beaches

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Talk about raised beaches

• These are areas of former wave-cut platforms and their beaches that are higher than the present sea level
•Common around the coasts in western Scotland
• Relict caves, arches, stacks, and stumps as seen in the west of the Isle of Arran

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Talk about marine platforms

• Marine platforms are where a gently sloping formerly submerged land has been exposed by uplift of the land or lowering sea levels

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Other cards in this set

Card 2

Front

What is isostatic change?

Back

A LOCAL change in sea level resulting from the LAND rising or falling relative to the sea. E.g ice causing the land to sink or rise after a melting period

Card 3

Front

Name examples of coastlines of submergence

Back

Card 4

Front

Talk about Fjords

Back

Card 5

Front

Talk about Rias

Back

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Coastlines of emergence and submergence