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An extrusive rock is a rock that has been deposited at the earths surface as a liquid/fluid, coming to the surface form a depth through a fissure in the earth as a liquid/fluid.
The most common type of liquid rock is a magma and magmas erupting at the surface are called "volcanoes" and thus the rocks are called "volcanic" rocks.
However there are also volcanoes to be found that have nothing to do with molten rock magmas. These are called "Mud" volcanoes and they are caused by de-watering processes in rocks. The muds brought to the surface are also technically extrusive and these are NOT volcanic rocks.
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Rocks formed from volcanic eruption are called what?
They are called extrusive igneous rocks.
What Has two kinds of instrusive and extrusive?
Volcanic rocks have two types: intrusive rocks and extrusive rocks. Intrusive rocks, also known as plutonic rocks, form when molten magma cools and solidifies underground. Extrusive rocks, also called volcanic rocks, form when molten lava erupts onto the Earth's surface and cools quickly.
A type of rock that forms at Earth's surface?
Extrusive or volcanic rocks
Igneous rocks that cool quickly on earth surface are?
Extrusive igneous rocks, like basalt, pumice, scoria, obsidian, and rhyolite.
What type of rocks form when lava cools after a volcanic eruption?
Igneous Rock is formed when a volcano erupts and the the lava cools down to harden. Pumice Stone Extrusive Rocks Glass Rocks Hope this Helps :)
Magma that is rejected during a volcanic eruption forms igneous rocks?
Magma that is ejected during a volcanic eruption forms extrusive igneous rocks. They are also referred to as volcanic rocks.
Are intrusive rocks volcanic?
No. Volcanic rocks are extrusive. Intrusive rocks are sometimes called plutonic.
Are volcanic rocks igneous rocks?
Yes. Volcanic rocks are extrusive igneous rocks.
Are metamorphic rocks volcanic?
No. Only extrusive igneous rocks are volcanic.
What are igneous rocks that form over the surface?
Rhyolititcen rocks.
What are volcanic rocks?
Volcanic rocks are classified as extrusive igneous rocks, forming from the solidification of lava.
What are types of volcanic rock?
Volcanic rocks are extrusive igneous rocks.
Rocks formed from volcanic eruption are called what?
They are called extrusive igneous rocks.
What are rocks called that formed from volcanic process?
Those would be igneous rocks. Extrusive igneous rocks.
What are igneous rocks that form above the earth called?
Extrusive (volcanic) igneous rocks.
What type of rocks formed when lava cools after volcanic eruption?
Extrusive igneous rocks
Volcanic activity creates what kind of rocks?
Volcanic activity produces extrusive igneous rock.
