Web Site of the Week

Each week, we highlight a Web site that we think may be helpful in some way to teachers. The highlighted sites are not part of or connected with Science News for Kids, Science News, or Science Service. We are not responsible for their content.

March 16, 2005

What's in the Dirt?

Curious about the abundance of various chemical elements in the area where you live? The U.S. Geological Survey offers a database of more than 60,000 chemical analyses of stream sediment and soil in different parts of the United States. Color-coded maps provide county-by-county data on the concentrations of such elements as mercury, arsenic, selenium, and lead. It's all part of the National Geochemical Survey.

Go to: tin.er.usgs.gov/geochem/doc/home.htm

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