Eustatic and Isostatic Change

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Eustatic and Isostatic Change

Eustatic Change - Global change in sea level linked to water - rise in temperature = rise in water level due to expansion of water (thermosteric change) and melting of ice caps - Fall in temperature = fall in water level due to shrinking of water (again, thermosteric change) and more water being stored as ice

Isostatic Change - Local change in sea level due to change in land height - weight of glaciers pushes land down and then it rises as glaciers melt

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Fjords

Long, narrow inlets with steep sides or cliffs

Formed when a glacier cuts a U-shaped valley by ice segregation and abrasion

Connected to the sea

Isostatic rise as the glacier melts is faster than sea level rise, meaning the bed of the fjord is below sea level

Melt water and sea floods the valley, forming the fjord

Glacial rock basin at the mouth - called the threshold

Example - Sogne Fjord, Norway (200km long)

Summary - a drowned, U-shaped, glacial valley

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