ಚಿತ್ರ:NA basement rocks.gif

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NA_basement_rocks.gif(೪೮೩ × ೪೨೭ ಚಿತ್ರಬಿಂದು, ಫೈಲಿನ ಗಾತ್ರ: ೧೯ KB, MIME ಪ್ರಕಾರ: image/gif)

ಸಾರಾಂಶ

ವಿವರ North American cratons and basement rocks.
English: Original image first published on Wikipedia 22 April 2005, since superseded by altered image; this one is being republished because altered image used colours too close to each other, and to accommodate those with visual difficulties
ದಿನಾಂಕ
ಆಕರ
ವಿವರ

North American cratons and basement rocks.

As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior of the mountain belts, patterns of age intervals were determined. These old rocks have been called the "basement". This has been interpreted to mean that the continents had somehow grown by development of rock assemblages with these characteristic age parameters. The expanding continental nuclei are part of the "craton" which consist of both exposed and buried basement rocks.
ದಿನಾಂಕ  Edit this at Structured Data on Commons
ಆಕರ http://rst.gsfc.nasa.gov/Sect2/14strprv.jpg or http://instruct.uwo.ca/earth-sci/300b-001/14strprv.gif English Wikipedia, original upload 22 April 2005 by Berkut Originally uploaded by User:SEWilco as Image:North america basement rocks.jpg.
ಕರ್ತೃ USGS
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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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ಕರ್ತೃ USGS

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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.

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Basement rocks in North America

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