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.
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| Date | |
| Source | http://toxics.usgs.gov/pubs/FS-051-02/pdf/fs-051-02.pdf |
| Author | U.S. Geological Survey |
Licensing
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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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