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
http://wiki.answers.com/Q/What_is_extrusive_igneou...
Only one is found which is basalt is an example of extrusive igneous
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Igneous rocks fall into two basic categories. Extrusive, or volcanic, is the name given to rocks that form at or near the Earth's surface through volcanic activity. Often found with
http://www.ehow.com/info_10011996_igneous-rocks.ht...
they are formed by lava cooling at or near the surface. Source(s)
http://answers.yahoo.com/question/index?qid=201204...
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