Sea level change landforms Flashcards
What is an emergent coastline?
formed when the sea level drops relative to the land (occurs during post-glacial periods/inter glacial periods) since the land rises faster than the sea level.
What is a submergent coastline?
formed when sea level rises relative to the land (sea level rises faster than the land during glacial periods).
What are the emergent landforms?
1.Raised beach
2.Fossil cliffs
3.Fossil wave cut platforms
What is a raised beach?
A relict beach now above high tide level
Give an example of a raised beach.
The Isle of Arran - 5m above present sea level.
What is a fossil cliff?
A steep slope found at the back of a raised beach exhibiting evidence of formation through marine erosion but now above high tide level.
Give an example of a fossil cliff.
At Lendalfoot there is a 40m raised cliff.
What is a fossil wave cut platform?
An extensive flat area in front of a relict cliff above the high tide mark.
Give an example of a fossil wave cut platform.
Fossil wave cut platform at East Amroth.
What is a fjord?
A glacial U-shaped valley which has been flooded by eustatic sea level rise
What is a dalmatian coast?
This is composed of long, narrow islands running parallel to the coastline and separated from the coast by narrow sea channels called sounds - this causes a series of alternating synclines and anticlines to form.
What is a ria?
A glacial V-shaped valley which has been flooded by eustatic sea level rise.
How is a ria formed?
When rising sea levels flood narrow inlets and river valleys. They are deeper at the mouth of the inlet and the water depth decreases further inland.
How is fjord formed?
When rising sea levels flood deep glacial valleys to create natural inlets and harbours. They are deeper in the middle section than they are at the mouth.
How is a dalmation coast formed?
When valleys running parallel to the coast become flooded as a result of sea level rise. This forms a series of narrow and long islands.
