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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number D115-1

These rare-earth oxides are used as tracers to determine which parts of a watershed are eroding. Clockwise from top center: praseodymium, cerium, lanthanum, neodymium, samarium, and gadolinium.

Photo by Peggy Greb.

640 pixels wide: (D115-1.jpg)

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Last Modified: 5/23/2006