This U.S.Geological Survey site shows how chemists and geologists use analytical chemistry to: determine the age of the Earth; show an extraterrestrial body collided with the Earth; predict volcanic eruptions; observe atmospheric change over millions of years; and document damage by acid rain and pollution of the Earth's surface.
Compiled by Joseph E. Taggart, Jr.
Edited by Carole A. Bales and Sonja K. Runberg
Graphics and photos by Richard P. Walker, Shawn T. Smith, and Steven M. Smith
Composition by Margo L. Johnson
Summary by 李晓霞 on 2003-02-12
Last updated by 李晓霞 on 2003-02-12