Igneous Geology and rocks photos
Igneous rocks
are those that have formed by cooling and crystallizing from a liquid state. If they cool below the surface (slowly) they tend to be fairly coarse grained and are called "intrusive"; if they cool above the surface (quickly) they tend to be fine-grained and are called "extrusive" or simply "volcanic".


click on either igneous category below to see more images from that group.

intrusive contact
Intrusive Rocks and Features

Mt. St. Helens and Mt. Rainier volcanoes
Volcanic Rocks and Features


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