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.
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