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Extrusive igneous rocks are usually fine grained.
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∙ 15y ago
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How can you determine if a igneous rock has had an intrusive or extrusive origin?
== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.
What is the grain size of an extrusive igneous?
It depend what rock it is but extrusive rocks generally non-crystalline or have a grain size of less than 1 mm
What are igneous rocks that form over the surface?
Rhyolititcen rocks.
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 are igneous rocks formed at the earths surface called?
Extrusive igneous rocks.
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.
What are two types of igneous rocks?
Two types of igneous rocks are intrusive which is found in a volcano. And extrusive which is found outside of a volcano.
How do fine- grained igneous rocks from?
extrusive igneous rocks =/
Where are the two types of igneous rocks made?
Extrusive igneous rocks , Intrusive igneous rocks
Are volcanic rocks igneous rocks?
Yes. Volcanic rocks are extrusive igneous rocks.
What igneous rocks are both intrusive and extrusive?
Porphyritic igneous rocks can display both intrusive and extrusive characteristics.
What is extrusive igneous rocks used for?
Extrusive igneous rocks i think are used for carving and awesome things like that!
