Petroglyphs are images created by removing part of a rock surface by incising, picking, carving, or abrading, as a form of rock art. Outside North America ...
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Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com.
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The Rock Gallery contains pictures and descriptions of common igneous metamorphic sedimentary rock. The igneous rocks are listed at the top of the page ...
Each has a thumbnail picture of the specimen and a brief description of it. ... It is common as a rock-forming mineral and is present in all three rock types: igneous ...
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