File:North america rock volcanic.jpg
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Four maps show the North American distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic rock.
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North American terrain -
North American rock types
Source
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.
Source: English Wikipedia, original upload 15 April 2005 by SEWilco
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:17, 16 September 2005 | | 644 × 526 (161 KB) | Saperaud~commonswiki | Four maps show the North American distribution of four principal types of rock: sedimentary, volcanic, plutonic and metamorphic rock. <gallery> Image:North america rock metamorphic.jpg| |
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