How do volcanic rocks differ in composition?


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.
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Composite volcanoes are formed during eruptions that emit lava and volcanic rock that flow very slowly. Because of its viscosity this material cools near the volcano ...
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 ...
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