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Extrusive rocks are formed outside of earths surface. Intrusive rocks are formed inside earths surface.
Mark Greenholt
Wiki User
∙ 12y agoExtrusive rocks are igneous rocks that form when a volcano erupts on Earth's surface. Intrusive rocks form from the cooling of magma below the surface. Extrusive rocks usually have smaller crystals than intrusive rocks, because extrusive rocks have less time to crystallize. They are suddenly in contact with much cooler air than the extreme temperatures of inside the earth. A way to remember this is relating intrusive and extrusive to the words interior and exterior. Extrusive forms outside the earth, and exterior means outside. Intrusive rock forms inside the earth, and interior means inside.
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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 marble an extrusive or an intrusive rock?
Neither. The terms intrusive and extrusive apply to igneous rocks; marble is metamorphic.
What are the features of intrusive igneouse rocks?
intrusive rocks have a finer texture and extrusive such as lava rock are more course. intrusive rocks are cooled within the earth and extrusive cooled outside the earth.
Which rocks are more likely to have a coarse grained extrusive or intrusive?
extrusive
Are felsic rocks usually intrusive or extrusive?
Most felsic rocks, though not all, are intrusive.
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.
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.
What igneous rocks are both intrusive and extrusive?
Porphyritic igneous rocks can display both intrusive and extrusive characteristics.
Does lava produce Extrusive or Intrusive rocks?
extrusive
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 feldspar extrusive or intrusive?
It is actually a mineral that appears in both extrusive and intrusive igneous rocks.
Contrast the ways in which extrusive and intrusive rocks are formed?
Intrusive rocks form within the crust of the Earth while extrusive rocks form on the surface.
Are intrusive rocks volcanic?
No. Volcanic rocks are extrusive. Intrusive rocks are sometimes called plutonic.
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 marble an extrusive or an intrusive rock?
Neither. The terms intrusive and extrusive apply to igneous rocks; marble is metamorphic.
What are the features of intrusive igneouse rocks?
intrusive rocks have a finer texture and extrusive such as lava rock are more course. intrusive rocks are cooled within the earth and extrusive cooled outside the earth.
Extrusive rocks which cool more rapidly than intrusive rocks generally have?
Extrusive rocks which cool more rapidly than intrusive rocks generally have smaller crystals.
