Image: Rareearthoxides
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Description: 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.
Title: Rareearthoxides
Credit: http://www.ars.usda.gov/is/graphics/photos/jun05/d115-1.htm
Author: Peggy Greb, US department of agriculture
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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