How is extrusive rocks formed?

How is extrusive rocks formed?
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Igneous refers to rocks of volcanic origin. "Extrusion" refersto the process of a material being forced through a cavity ofanother material. (Think "Play-Doh Fun Factory." :) ) So, extrudedigneous rocks are formed when liquid magma (volcanic rock) isforced through an opening (like a volcanic vent) and then cools andhardens into volcanic rock.
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