Landforms If Emergent And Submergent Coastlines Flashcards
What is isostatic sea level change
Local sea level change (relative)
For example if the land is falling
What is euststic sea level change
Global sea level change (change in water volume)
What are the features of isostatic sea level change and why does it happen
Slow process
Caused by land rising or falling due to ice sheets during ice age
What are some features of euststic sea level change and why does it occur
Ice melting
Caused by temperature changes- cuasing thermal expansion
What are features formed by submergence created by
Euststic sea level rise
Isostatic sea level fall-land is falling
How are land features formed by emergence created
Euststic sea level fall
Isostatic - land is rising
What is a description of a raised beach , what type of landform is it
A raised beach is formed when a beach once at sea level is lifted above the current shoreline due to a isostatic fall in sea level-land rebounding
Emergence landform
What is a description of ria formation and what type of landform is it
Rias are a funnel shaped estuary that occurs at a river mouth
Formed by submergence of river valley by rising euststic sea level
Submergence landform
River at mouth gets larger as tributaries are flooded
How are fjords formed and what type of landform are they
A glacier carved out a deep steep sided valley via erosion and retreats-. Sea water floods the depression and freshwater does also from rainwater in the valleys
Submergence
Freshwater and saltwater experience limited mixing because of the sill
How are marine platforms formed and what type of landform are they
Wave cut notch formation- undercut between high and low tide, cave , unconsolidated rock collapses- leaves behind a flat horizontal rock
Emergent
How are fossil cliffs formed and what type of landform are they
Former sea cliff now above the current high tide level
Sea levels fall (isostatic ) from land rebounding
Linked to raised beaches
Emergent
How are the dalmation coasts formed and what type of landform are they
Euststic sea levels flood a pre-existing landscape of elongated folds of rock (valleys)
Coastline now has long narrow islands running parallel to mainline
Submergence
