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Extrusive igneous rocks are fine grained due to fast cooling. They cool at a faster rate than most igneous rocks.
Paul Wyman
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How fast do coarse grained and fine grained rocks cool?
If the rocks are igneous then in general:- Coarse = slowly. Fine = fast. However if the rocks are metamorphic or sedimentary then grain size has nothing to do with cooling and indicates other things.
What igneous rock are fine-grained due to fast cooling?
Basalt
Is igneous rock that formed from cooling lava fined-grained?
yes because of the fast cooling rate
What rocks are formed by fast cooling magma?
igneous rocks
What effect does a fast cooling rate have on grain size in igenous rocks?
Fast cooling lava or magma creates an aphanitic or small crystal (grain) textured igneous rock.
Which igneous rocks fine grained due to fast cooling?
When igneous rocks form by cooling quickly, their microstructure includes fine grains. It is the aphanitic igneous rock that includes andesite, basalt, and rhyolite. Wikipedia has more information, and a link is provided below. If you wish to wade on into the depths of rock microstructures, you can link on from there.
What kind of igneous rock texture results from slow cooling magma?
A coarse grained texture, referred to as a phaneritic texture, will be the resultant igneous rock texture. The slower the magma cools the more time minerals have to crystallize and thus grow bigger.
What are the igneous rocks that are formed by fast-cooling lava?
Extrusive
What is the difference between intrusive and igneous rocks?
The difference between an Extrusive and Intrusive igneous rock is the way in which they cool. An Extrusive igneous rock cools very fast on the surface and is created by lava. Since the cooling process is very fast extrusive igneous rocks have very small crystals (fine grained). On the other hand an Intrusive igneous rock cools very slowly beneath the surface and is created by magma. Since the cooling process is very slow intrusive igneous rocks have very large crystals (coarse grained). In some instances there is also a third type of igneous rock. Technically it is an extrusive rock, but it resembles glass. This glass type of igneous rock forms when magma/lava is instantly cooled.
What type of rock that forms from magma or lava is rock?
Igneous rock is formed from the cooling of magma or lava.
Are volcanic rocks fine grained?
yes because of fast cooling rate
Why do igneous rocks have either have fined or coarsed grained?
The texture is mostly dependent on the amount of time the magma or lava had to crystallize into a solid rock. Volcanic rock is formed from quickly cooling lava (also called extrusive igneous rock), and will have a fine-grained texture. Plutonic rock (also called intrusive igneous rock) is formed from slow cooling magma, and will exhibit visible crystals.
