Sea level change Flashcards

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1
Q

What is Eustatic change

A

A global change in sea level resulting from an actual rise or fall in the level of the sea itself.

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2
Q

What is a isostatic change

A

Local change in sea level resulting from the land rising or falling relative to the sea

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3
Q

Causes of Eustatic change

A

-Thermal expansion/contraction of sea
-Ice accumulation on land-sea level fall
-Ice ablation-sea level rise

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4
Q

Causes of Isostatic change

A

-Tectonic movement.
-Isostatic rebound

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5
Q

Sequence of sea level change

A

1-As climate begins to get colder, increasing amount of ppt falls as snow. Eventually, this snow turns into glacier ice. Snow and ice act as a store of water. Sea level falls. Eustatic fall.
2- The weight of Ice causes the land surface to sink. Isostatic fall so relative sea level rise.
3- The climate begins to get warmer. Eventually the ice masses on the land begin to melt. Eustatic sea level rise.
4- As the ice is removed, land rebounds, isostatic re adjustment

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6
Q

Examples of sea level change due to tectonic activity

A

1) The uplift of mountain ranges and coastal land at destructive plate margins that resulted in a relative fall in sea level.

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7
Q

What is Fjord

A

A drowned glacial valley. U shaped cross section with hanging valleys on either side. Straight. Shallower section at the end called threshold, where the ice exited the valley and floated into sea.

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8
Q

What is a Rias

A

A flooded river valley, dendritic pattern. e.g Kingsbridge estuary Devon. - relative sea level rise due to eustatic rise.
-Isostatic depression as Scotland rises, re bounding

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9
Q

What sea level rise is predicted if we dop not change our ways

A

4m

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10
Q

Fairbourne Wales

A

Predicted to flood in 25 years time. 850 people will be displaced and become UK first climate refugees.

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11
Q

What are emergent features

A

Result of relative sea level fall

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12
Q

What are raised beaches

A

Former WCP which is now raised above sea level.
e.g Kings cave Scotland

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13
Q

What are Submergent features

A

Result from relative sea level rise

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14
Q

Example of submergent feature

A

Dalmatian coast- Islands running parallel to the coast. Formed from river valleys running parallel to the sea, which were then flooded by the sea.

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