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Igneous rock form from the cooling solidification of lava or magma.
Instruisive rocks are large rocks they form large because the magma cools slowly.
Extrusive rocks form small or no crystals because the lava cools slowly and maybe vesicular it can contain air bubbles.
Examples: Intrusive rocks are granite which has Feldspar, quartz, and mica. Intrusive can be used for building and their light colored high silica.
Examples for Extrusive: Extrusive rocks are Basalt= low silica, Obsidan= Volcanic glass, and Pumice= Vesicular, floats
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