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Why are igneous rocks classified into subcategories of intrusive and extrusive?
Wiki User
∙ 11y ago
That classification is on the basis of there environment of formation.Intrusive form deep into the earth from magma while Extrusive form at the surface from cooling lava flows.
Wiki User
∙ 11y ago
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Is obsidian a intrusive or extrusive igneous rock?
Andesite is considered an extrusive igneous rock.
Is dunite an intrusive or extrusive igneous rock?
intrusive
Is marble an extrusive or an intrusive rock?
Neither. The terms intrusive and extrusive apply to igneous rocks; marble is metamorphic.
How igneous rock classified?
Geologists classify rocks by where they are formed; above ground or under ground
Is Mt Rushmore intrusive or extrusive igneous rock?
Intrusive Igneous rock because it is made of granite and granite is intrusive igneous rock
Igneous rocks can be classified into which 2 groups?
Intrusive and 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.
Is schist an intrusive or extrusive rock?
Neither, Igneous rock is either intrusive or extrusive. Thats what intrusive and extrusive is... A igneous rock.
Is diorite intrusive or extrusive?
Diorite is an intrusive igneous rock. Its extrusive equivalent is andesite.
Is obsidian a intrusive or extrusive igneous rock?
Andesite is considered an extrusive igneous rock.
What igneous rocks are both intrusive and extrusive?
Porphyritic igneous rocks can display both intrusive and extrusive characteristics.
What is the difference between an intrusive and an extrusive igneous rocks?
"intrusive" means forced into something, "extrusive" means forced out onto the surface. The igneous magma reaching the surface is therefore extrusive , producing extrusive igneous rocks, and all the rest of the magma is intrusive, producing intrusive igneous rocks.
Is dunite an intrusive or extrusive igneous rock?
intrusive
Are large crystals intrusive or extrusive igneous rock?
Intrusive
Is feldspar extrusive or intrusive?
It is actually a mineral that appears in both extrusive and intrusive igneous rocks.
Can rocks both have igneous and intrusive?
Since igneous rocks are divided into two categories (intrusive and extrusive) an igneous rocks can be intrusive.
Is marble an extrusive or an intrusive rock?
Neither. The terms intrusive and extrusive apply to igneous rocks; marble is metamorphic.
