What is discordant rock?
What is discordant rock?
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.
What are discordant plutons?
[di′skȯrd·ənt ′plü‚tän] (geology) An intrusive igneous body that cuts across the bedding or foliation of the intruded formations.
How do you explain igneous rock to a child?
Igneous rocks are formed by solidification of cooled magma (molten rock) either below (plutonic) or above (volcanic) the surface of the earth. The magma consists of partial melting of pre-existing rock and can be caused by one or a combination of; an increase in temperature, pressure changes, change in composition.
What is an intrusive rock simple definition?
intrusive rock, also called plutonic rock, igneous rock formed from magma forced into older rocks at depths within the Earth’s crust, which then slowly solidifies below the Earth’s surface, though it may later be exposed by erosion. See also extrusive rock.
What does discordant mean in geography?
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 converse of a discordant coastline is a concordant coastline.
What is concordance and discordance?
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.
Is sill concordant or discordant?
A dike is a tabular body of igneous rock cutting across bedding and hence, discordant. A sill is a tabular body which is concordant. A blister shaped sill is called a laccolith.
Is batholith concordant or discordant?
– In scientific terms, a batholith is a large irregular discordant intrusion. Stocks are narrow shapes protruding from a batholith into cracks in the host rock. They may be an only surface expression of an underlying batholith.
How are igneous rocks formed short answer?
Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
What are igneous rocks for Class 5?
Igneous rocks are formed by the cooling and hardening of hot liquid Rock material, that lies in huge underground pockets of the earth which Is called magma. Magma gets pushed upward towards the surface of the earth because of the pressure inside. On the surface it cools to form solid rock which is called igneous rock.
What are the intrusive igneous rocks?
Intrusive igneous rocks crystallize below Earth’s surface, and the slow cooling that occurs there allows large crystals to form. Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Dacite is a fine-grained, extrusive igneous rock that is usually light in color.
What is a discordant coastline geography?
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. North of Swanage, the chalk outcrop creates the headland which includes Old Harry Rocks.
