How Do Volcanic Rocks Differ in Composition?

Answer

Volcanic rocks differ due to their rapid eruption as well as the time it takes to cool down. This makes some to be plutonic while others are extrusive.
Q&A Related to "How Do Volcanic Rocks Differ in Composition?"
They differ because of the speed and the depth of the cooling process.
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Both are igneous rocks, but whereas volcanic rocks are formed from cooling lava on the surface, plutonic rocks are formed from cooling magma below the surface. So plutonic rock is
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The main difference is that plutonic rocks are formed underground, while volcanic rocks are formed above ground. report this answer. Updated on Thursday, February 02 2012 at 07:56AM
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Fundamentally, volcanic rocks are rocks that have been expelled, as lava or other "extrusive" onto the earth's surface (or underwater) Examples include basalt, rhyolite-
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