Rareearthoxides

Forfatter/Opretter:

Peggy Greb, US department of agriculture

Kredit:

http://www.ars.usda.gov/is/graphics/photos/jun05/d115-1.htm

Shortlink:

https://dkwiki.dk/b/1376c

kilde:

Wikimedia Commons

størrelse:

1200 x 780 Pixel (586902 Bytes)

beskrivelse:

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.

Licens:

Public domain