rare earth oxides

Detailed 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. Image Number D1115-1. Photo by Peggy Greb, USDA-ARS.

Details

Image Dimensions: 2700 x 1754

Date Taken:

Location Taken: US

Source:

USDA Agricultural Research Service Image Gallery
http://www.ars.usda.gov/News/docs.htm?docid=23559