Types Of Coastlines

Question 1

What are the two types of coastlines

Answer 1

Submergent

Emergent

Question 2

What is a submergent coastline

Answer 2

Has a rising sea level

Question 3

What is an emergent coastline

Answer 3

Has a falling sea level

Question 4

What landforms are formed by submergence

Answer 4

Rias

Fjords

Dalmatian coastline

Question 5

What landforms are formed by emergence

Answer 5

Raised beach’s

Marine platforms

Question 6

What is a rias

Answer 6

Ria is a drowned river valley formed by rising sea levels during post glacial periods

Occur in un-glaciated, lowland, coastal areas where river valleys gently slope

Sea levels rise causing lower course of the river to flood

Creates a submerged, funnel shaped inlet with a bran hung pattern

Question 7

What is a fjord

Answer 7

Glaciers erode deep U shaped valleys through plucking and abrasion

Glaciers often follow the path of pre existing river valleys

When glaciers retreat/melt they leave behind steap sided valleys

These valleys are then flooded by rising sea levels

Question 8

What are Dalmatian coasts

Answer 8

Form where valleys and ridges run parallel to the coast

During post glacial, sea levels rise, lower parts of these valleys are flooded

The ridges however remain above sea level, creating long islands that run parallel to the coast

Creates multiple islands that align with the original topography

Question 9

What are raised beaches

Answer 9

Form when sea levels fall or land levels rise, exposing former shorelines

Called isostaic rebound, as land rise once glaciers melt

The former beach is left above the current sea level

These areas show evidence of marine erosion, like smooth rocks

Question 10

What are marine platforms

Answer 10

Constant erosion at base of the cliff forms a notch

Overtime the notch deepens and makes cliff above unstable, causing it to collapse

As the cliff retreats inland, a flat area of rock is left behind

This is a wave cut platform which is visible at low tide