What Is the Difference between Intrusive and Extrusive Igneous Rock?

Answer

Extrusive igneous rock is an igneous rock that is formed on the Earth's surface by volcanic activity. This is opposed to plutonic or intrusive rocks, which solidify below the surface of the Earth. Geographically, magma or molten rocks that erupt from volcanoes cools down and solidifies rapidly on the surface.
Q&A Related to "What Is the Difference between Intrusive and..."
Extrusive igneous rock is formed from the solidification of lava on or above the surface. Rapid cooling from exposure to air or water results in rapid crystallization of their component
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Extrusive Igneous Rock forms by the freezing of lava above ground,
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The most common intusive igneous rock is granite. Other common intrusive rocks are gabbro, diorite, pegmatite, syenite and albite. The most common extrusive rocks are basalt and andesite
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Igneous rocks are formed as the result of cooling magmas.
http://wiki.answers.com/Q/What_are_igneous_rocks_f...
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