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Types of Volcanic Rock
12" x 18"
Photographic Print

Types of volcanic rock Table showing different extrusive volcanic igneous rocks Left from top scoria basalt gabbro Right from top obsidian rhyolite granite Extrusive igneous rocks form when molten rock magma is cooled outside the ground either in the air or underwater Each rocks properties depend on how fast it cools and how much silica is present The faster it cools the finer the grains within the rock Here the left arrow shows the speed of cooling size of grain where red is slow coarse grained and blue is fast fine grained The top arrow shows increasing silica content from left mafic to right felsic

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