Geoglogical Structure

Question 1

concordant

Answer 1

alternating bands of hard and soft rock parallel to the coast.

Question 2

discordant

Answer 2

Discordant coastlines have alternating bands of hard and soft rock at 90o to the coast.

Question 3

which type of coastline has more erosional landforms and why?

Answer 3

discordant
erosion happens at different rates along their length.

Question 4

example of a discordant coast

Answer 4

in Dorset, the coastline consists of Portland limestone and Greensands.

Question 5

Dalmatian coasts

Answer 5

are made up of offshore islands and coastal inlets running parallel to the coastline.

Question 6

example of Dalmatian coast

Answer 6

lulworth cove
located on the south-west Dorset coastline. Here, the more-resistant rock (e.g. limestone) acts as a barrier to protect the less-resistant rock.

Question 7

where are bays and headlands formed?

Answer 7

discordant coastlines

Question 8

How are bays and headlands formed?

Answer 8

On discordant coastlines, the retreating, less resistant rock and the exposed resistant rocks cause a change in the shape of the coastline. This leads to wave refraction.
This change in the way in which waves approach the coastline can cause an increase in the rate of erosion on the headlands.
This leads to the formation of headland features like caves, arches, stacks and stumps.

Question 9

Dip

Answer 9

he angle the rock layer forms with the horizontal bedding plane is referred to as the dip. Rocks can dip either towards land or towards the sea.
Bedding planes that dip towards the sea create a gentler cliff profile. But these cliffs are vulnerable to mass movement processes, like rockfalls.
Bedding planes that dip towards land tend to create a steeper cliff profile. But these cliffs are more vulnerable to erosion processes, like hydraulic action and abrasion.