4.3 4.4 4.5 Flashcards
What is the rock type like on a concordant coastline?
A concordant, longitudinal, or Pacific type coastline occurs where beds, or layers, of differing rock types are folded into ridges that run parallel to the coast. The outer hard rock (for example, granite) provides a protective barrier to erosion of the softer rocks (for example, clays) further inland.
An example of the different coastlines would be that some have harder rocks whereas others have soft rock in the land.
The rocks change if the land will be concordant or discordant and this could lead to the formation of headlands and bays dependant on which one
What is the rock type like on a discordant coastline?
A discordant coastline occurs where bands of different rock type run perpendicular to the coast. The differing resistance to erosion leads to the formation of headlands and bays.
An example of the different coastlines would be that some have harder rocks whereas others have soft rock in the land.
The rocks change if the land will be concordant or discordant and this could lead to the formation of headlands and bays dependant on which one
What features are found on a concordant coastline?
concordant coastlines can form many different landforms from the rock and is usually bays which are formed as the differing rock can be hard and soft.
for example ; Along the coastline of the Isle of Purbeck in Dorset, there are both discordant and concordant coastlines.
What features are found on a discordant coastline?
discordant coastline can form different types of rock.
for example ; Along the coastline of the Isle of Purbeck in Dorset, there are both discordant and concordant coastlines. The discordant coastline has been formed into Studland Bay (soft rock), Ballard Point (hard rock), Swanage Bay (soft rock) and Durlston Head (hard rock).
What are joints and faults and how do they affect erosion
Joints and faults ; the more faults and joints a rock has the more susceptible it is to erosion, both from coastal and sub-aerial processes.
This could form land or rocks which could be eroded and transferred via long shore drift to turn into a beach or spit.
What is the difference between hard and soft rocks, give examples?
Soft rocks are those types of the phrases soft rock are hard banded around it. In nature marble is a hard rock. When we see rocks are of different colors and kinds. Difference between hard rock and soft rock are the molecules that make up the rock and its self.
These types if rocks can usually be a build up of sand over the years from erosion and can create landforms such as spits.
What affects wave energy?
The wave energy is affected by gravity and all that is around the waves, this could be protection etc. The largest form of gravity is the one from the moon and this has a major affect on the waves in the sea and all the energy that surrounds it.
Where in the UK has the biggest waves and why?
The Eastern Side of the uk is hit with the biggest waves as northern prevailing winds creates large waves down the english channel. This is because the english channel funnels the prevailing winds which will form waves that are very large.
Define abrasion, hydraulic action, attrition and solution.
abrasion is the erosion of rocks and sediment, Hydraulic action is the erosion of rocks by waves or the sea itself. Attrition is two rocks banging against each other eroding and solution is the water dissolving the rock into the sea.
Explain how longshore drift works.
Long shore drift is where swash and backwash transports sediment from one beach to the next at a fast speed through the year. An result of long shore drift could be larger beaches or even spits being formed out to sea.
Explain how spits form and the characteristicts.
Spits are formed from longshore drift and when sediment is transported along the beach. It happens when the prevailing winds blow against the waves to form longshore drift and transport sediment.
Explain how beaches form?
Beaches form where rocks and cliffs collapse and break over the years from different types of erosion this could happen when a rock is eroded and the sediment is transported to form a large mass or beach.
Compare a spit to a bar?
a spit is a land mass that goes out to the sea and ends whilst out at sea whereas a bar is where the spit has had so much sediment moved that it reattaches to solid land often forming large lagoons. This often happens when land is formed within bays and between two headlands.
How does dredging affect coastline?
Dredging affects the coastline as by clearing up and bad sediment or material from the bottom of the sea you will be able to have a very well and productive coastline with more constructive than destructive ways near by being formed by the sea and ocean.
How does industry affect coastline?
Industry has affected coastline as beaches may have changed and any industry near a coastline would need forms of coastal management in order to protect them from being destroyed by winds and waves that occur from the sea.
