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Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. This is as opposed to intrusive rock formation, in which magma does not reach the surface. The main effect of extrusion is that the magma can cool much more quickly in the open air or under seawater, and there is little time for the growth of crystals.
Granite and basalt are the most common types of igneous rock.   Igneous rock types, or classifications, also include those that are intrusive and extrusive.Intrusive igneo â¦ us rock is formed from the solidification of slow cooling magma below the surface.Extrusive igneous rock is formed for the solidification of rapidly cooling lava at or near the surface.12 people found this useful. Alex Buckley.onfidence votes 3. To the people that are doing the Rock Worksheet the answer for problem #5 is in the paper but the answer is actually (what I put), Another name for igneous rocks is the rock of fire..