Image:North america rock metamorphic.jpg
Categories: NowCommons | USGS images | Images of North America
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Four maps show the North American distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic rock.
 North American terrain |
 North American rock types |
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Source
| This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy.
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Home: http://pubs.usgs.gov/imap/i2781/
Image: http://pubs.usgs.gov/imap/i2781/i2781_c_low.pdf 144 dpi, encoded to 72 dpi JPEG, compressed slightly to fit within Wikipedia 2MB limit.
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