Brainstorm – can you think of reasons why coastlines would be submerged under water or rise above sea level?

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Presentation transcript:

Brainstorm – can you think of reasons why coastlines would be submerged under water or rise above sea level?

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Submergent Coastline A coastline inundated by the sea due to a relative rise in sea levels Examples: Rias (drowned river valleys) Fjords (drowned glaciated valleys)

Submergent coastlines experience "drowned" landforms Rias Drowned river valley Almost always estuaries V shaped valleys which were previously at sea level become submerged.

Georges River, in the southern suburbs of Sydney (Australia) is a ria, or drowned river valley. The deeply indented shape of the ria reflects the pattern of drainage that existed before the rise in sea level that flooded the valley.

Fjords drowned glacial valley narrow inlet of the sea between cliffs or steep slopes Typical characteristics of a fjord include: a narrow inlet deep to allow easy ship navigation steep-sided walls

Eustasy: changes in the amount of water in oceans

Emergent coastline Coastlines which have experienced a fall in sea level Caused by: Tectonic activity eg. Plate movement causes uplift Isostatic uplift (when ice melts and land rises) Examples: Wave Cut Platforms Raised Beaches

Isostasy: earth rebounding (moving up) from heavy ice load

Hudson Bay Rising as much as 0.67 inches per year due to post-glacial rebound (isostasy) and mantle convection

Raised beaches Beach raised above the shore line by a relative fall in the sea level.