What is a discordant coastline BBC Bitesize?
What is a discordant coastline BBC Bitesize?
Coastlines where the geology alternates between strata (or bands) of hard rock and soft rock are called discordant coastlines. A concordant coastline has the same type of rock along its length. Concordant coastlines tend to have fewer bays and headlands.
How is a discordant coastline formed?
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. The Portland limestone is resistant to erosion; then to the north there is a bay at Swanage where the rock type is a softer greensand.
What is concordant and discordant?
A pair of observations is concordant if the subject who is higher on one variable is also higher on the other variable. A pair of observations is discordant if the subject who is higher on one variable is lower on the other variable.
What is coastal erosion BBC Bitesize?
Coastal erosion is the wearing away and breaking up of rock along the coast. Destructive waves erode the coastline in a number of ways: Hydraulic action: Air may become trapped in joints and cracks on a cliff face. Solution: Acids contained in sea water will dissolve some types of rock such as chalk or limestone.
What is discordance and concordance?
Concordance, as used in genetics, usually means the presence of the same trait in both members of a pair of twins. Discordance, in genetics typically means that a similar trait is not shared between twin members.
Where is a discordant coastline?
​Discordant These are where rock strata or structures are aligned at an angle to the coastline. Discordant coasts have a crenellated pattern of projecting headlands and indented bays. Discordant coasts are also known as Atlantic coasts, after the Cork coastline in the Republic of Ireland.
What features can be found on a discordant coastline?
Discordant coastline occurs where bands of differing rock type run perpendicular to the coast. The differing resistance to erosion leads to the formation of headlands and bays. A hard rock type is resistant to erosion and creates a promontory whilst a softer rock type is easily eroded creating a bay.
How do concordant and discordant coastlines differ?
A concordant, or longitudinal type coastline occurs where beds, or layers, of differing rock types are folded into ridges that run parallel to the coast. A discordant coastline occurs where bands of different rock type run perpendicular to the coast.
How does the sea shape the coastline ks2?
When the sea erodes the cliffs, large rocks fall away and into the sea. These rocks are tossed about by the action of the sea and they are eroded into smaller and smaller pebbles. The pebbles are eventually ground down into the tiny gains of sand that form a beach.
What is a discordant coastline?
This is called a discordant coastline. The soft rock is made of clay and sands, and the hard rock is chalk and limestone. As erosion processes take place, the clay erodes away quicker than the limestone and chalk. This forms headlands and bays, creating Swanage Bay and two headlands – Ballard Point and Durlston Head.
What is the concordant coastline of Victoria?
The discordant coastline has been formed into Studland Bay (soft rock), Ballard Point (hard rock), Swanage Bay (soft rock) and Durlston Head (hard rock). After Durlston Head, the strata stop alternating and the coastline is made up of hard rock. This concordant coast has fewer features.
Why do cliffs along the coastline do not erode at the same pace?
Cliffs along the coastline do not erode at the same pace. When a stretch of coastline is formed from different types of rock, headlands and bays can form. Bands of soft rock such as clay and sand are weaker therefore they can be eroded quickly.
What is a concordant coastline in geology?
Geology is the study of the types of rocks that make up the Earth’s crust. Coastlines where the geology alternates between strata (or bands) of hard rock and soft rock are called discordant coastlines. A concordant coastline has the same type of rock along its length. Concordant coastlines tend to have fewer bays and headlands.
