Sea level change landforms
- Created by: EEC2145
- Created on: 01-03-23 12:23
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- Landforms from sea level change
- Emergent landforms
- Occurs when sea level drops.
- Sea level drops due to a cooler climate
- Cooler temperatures means the water molecules contract. They become less dense and take up less volume.
- Thermal compression
- More precipitation falls as snow.
- Lowering surface run off, hence lowering global sea levels
- More surface water is stored in glaciers and ice sheets causing a reduction in water molecules in the ocean, lowering sea levels.
- Cooler temperatures means the water molecules contract. They become less dense and take up less volume.
- Wurm Glacial period (25,000 years ago)
- Temps 9*C lower than today
- Sea level drops due to a cooler climate
- Landforms with a raised beach.
- Abandoned cliff
- Above the current sea level, can have caves and other evidence it was previously in use
- Marine terrace
- Previous shore platform (if high energy environment)
- A raised beach if in a low energy environment
- Waterfalls that are left 'hanging' which would've just flown straight into the sea
- Modifications
- Although not being eroded by marine processes, Weathering still occurs
- Vegetation may grow where previously it could not.
- Biological weather may increase due to an increase in limpets.
- Abandoned cliff
- Occurs when sea level drops.
- Submergent
- Occurs when sea levels rise
- Sea levels rise due to a warmer climate
- Warmer temperatures means the water molecules expand. They become more dense and take up more volume.
- Thermal expansion
- Surface stores in glaciers and ice sheets reduce as they melt.
- Increase in surface run off, hence raising sea levels
- Warmer temperatures means the water molecules expand. They become more dense and take up more volume.
- Flandrian Transgression (6000 years ago)
- Sea levels rise due to a warmer climate
- Rias
- Submerged river valley
- Cross section has relatively shallow water getting deeper towards the centre.
- Long section has uniform depth
- A number of rias can be found on the South coast of Devon and Cornwall
- Fjords
- Submerged glacial valley
- Steep sided v-shaped valleys
- Incredibly deep, >1000m
- Milford Sound, New Zealand
- The Sogne Fjord in Norway is nearly 200km long
- Marine processes still relatively high, deepening the fjord grasually
- Sometimes are filled in slightly with sediments.
- Occurs when sea levels rise
- Emergent landforms
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