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Coal is not a intrusive igneous rock but is instead a form of Carbon. The carbon is heated and pressured from low grade metamorphism. Coal is formed mostly from marshes or swamps millions of years ago, think of an environment like the everglades in Florida. A igneous rock would be something like a gabbro or granite.
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Is coal an extrusive or an intrusive?
Coal is a sedimentary rock, except for anthracite, which is metamorphosed coal. Extrusive and intrusive are terms only applied to igneous rocks. Extrusive igneous rocks are solidified from lava at or near the surface, and intrusive igneous rocks are solidified from magma below the surface.
A lava flow is an example of an igneous rock one of the two main igneous rock groups?
It is an example of extrusive igneous rock.
What are igneous rocks formed at the earths surface called?
Extrusive igneous rocks.
Is diorite intrusive or extrusive?
Diorite is an intrusive igneous rock. Its extrusive equivalent is andesite.
What type of rock is formed when lava flowing from a volcano cools and hardens?
Extrusive igneous rock is formed from cooling lava.
What example of a extrusive igneous rock is?
coal
Is coal an extrusive or an intrusive?
Coal is a sedimentary rock, except for anthracite, which is metamorphosed coal. Extrusive and intrusive are terms only applied to igneous rocks. Extrusive igneous rocks are solidified from lava at or near the surface, and intrusive igneous rocks are solidified from magma below the surface.
A lava flow is an example of an igneous rock one of the two main igneous rock groups?
It is an example of extrusive igneous rock.
Is coal extrusive igneous rock?
No, coal is a sedimentary rock composed mostly of the remains of ancient vegetation (except for anthracite coal which is a metamorphic rock, see image above)..
What is the most extrusive igneous rock?
Basalt is the most common extrusive igneous rock.
What kind of rock is formed after a volcano erupts?
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
Which is not a common extrusive igneous rock?
There are so many rocks that can be classified as not a common extrusive igneous rock. The most common extrusive igneous rock is basalt. Extrusive rocks are formed as a result of lava solidifying.
Is pumice an igneous rock?
YES! It is an extrusive Igneous rock
Is obsidian a intrusive or extrusive igneous rock?
Andesite is considered an extrusive igneous rock.
Is schist an intrusive or extrusive rock?
Neither, Igneous rock is either intrusive or extrusive. Thats what intrusive and extrusive is... A igneous rock.
What are igneous rocks formed at the earths surface called?
Extrusive igneous rocks.
Is tuff an extrusive igneous rock?
Yes. Tuff is an extrusive igneous rock formed by explosive volcanic eruptions.
