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File:Mercury in Ice Core Upper Fremont Glacier.svg

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Summary

Description
English: Atmospheric mercury deposition corresponds to volcanic and anthropogenic events over the past 270 years. Preindustrial deposition rates can be conservatively extrapolated to present time (4 ng/L; in green) to illustrate the increase during the past 100 years (in red) and significant decreases in the past 15-20 years.
Date
Source http://toxics.usgs.gov/pubs/FS-051-02/pdf/fs-051-02.pdf
Author U.S. Geological Survey

Licensing

Public domain
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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File history

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Date/TimeDimensionsUserComment
current09:25, 8 November 2011744 × 1,052 (175 KB)RedAndrfinal version

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