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By Environmental Health Program 2013 (approx.)
Predicted probabilities of arsenic concentrations show in a gradient from white to dark brown
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Detailed Description

Model-predicted probabilities of arsenic concentrations in groundwater from bedrock aquifers in New Hampshire: (A), greater than or equal to 1 microgram per liter (µg/L); (B), greater than or equal to 5 µg/L; and (C), greater than or equal to 10 µg/L. 

Sources/Usage

Public Domain.

Image source: USGS Scientific Investigations Report 2012-5156.