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Extrusive igneous rocks are formed by magma. The magma is crystallized after being pushed to the surface of the Earth. They usually are very fine grained. A really common extrusive rock would be Basalt.
What else can I help you with?
How extrusive rocks form?
extrusive rocks can form from Basaltic Lava and Andesitic Lava. :)
Does lava produce Extrusive or Intrusive rocks?
extrusive
What are the main two types of igneous rocks?
Igneous rocks are classified as either extrusive or intrusive. Extrusive rocks form from lava at or above the ground, and intrusive rocks form from magma below the ground. Granite is intrusive, pumice is extrusive.
What are igneous rocks that form over the surface?
Rhyolititcen rocks.
What grain type is found in extrusive igneous rocks?
Extrusive igneous rocks are usually fine grained.
What kind of igneous rocks for on earths surface?
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.
Igneous rocks are described as intrusive or extrusive based on?
Igneous rocks are described as intrusive or extrusive based on formation. Intrusive rocks forms underneath the earth surface, while extrusive rocks forms on the surface of earth.
Is mica extrusive?
No. A mineral is not inherently extrusive or intrusive. Mica can be found in intrisive igneous rocks and in metamorphic rocks.
What is extrusive igneous rocks used for?
Extrusive igneous rocks i think are used for carving and awesome things like that!
Is extrusive a rock?
Igneous rocks can be categorized as either extrusive or intrusive.
Which rocks are more likely to have a coarse grained extrusive or intrusive?
extrusive
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.
