Coastal landforms Flashcards
What coastlines are headlands and bays created on?
Discordant
What is a discordant coastline?
A discordant coastline is where rocks of varying resistance lie at right angles to the sea
The bays are made from…?
The bays are made from less resistant rocks
Which erosion all process takes place rapidly?
The erosional process that takes place rapidly is abrasion.
What happens when the land retreats?
As the land retreats, the waves are less powerful causing hydraulic action to take place.
What does hydraulic action result in?
Hydraulic action leads to a sandy beach being formed
What landform is made from ‘more resistant’ rock?
The headlands are made from more resistant rock.
What does ‘more resistant’ rock do?
More resistant rock erodes more slowly and protrudes into the sea
What happens to headlands over time?
In time, headlands protruding into the sea will experience the more powerful waves.
What erosional processes help widen the joint?
Hydraulic action helps widen the joint.
When the joint widens what is formed?
A cave is formed when a joint widens.
What happens if the sea exploits both sides of the headland?
An ‘arch’ is formed if both sides of the headland are being exploited.
What physical processes are in place when the base of the arch is being eroded?
Abrasion
When is abrasion taken place?
When the base of the arch is being eroded abrasion takes place.
How does the roof of the arch collapse?
Freeze thawing causes the roof to collapse.
