File:Rareearthoxides.jpg

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English: 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.
来源 http://www.ars.usda.gov/is/graphics/photos/jun05/d115-1.htm
作者 Peggy Greb, US department of agriculture

许可协议[编辑]

Public domain This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture.

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The original description page was here. All following user names refer to en.wikipedia.
  • 2009-06-27 10:49 Materialscientist 640×416× (175375 bytes) {{Information |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. |Source = http://ww

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当前2015年4月25日 (六) 11:382015年4月25日 (六) 11:38版本的缩略图1,200 × 780(573 KB)Materialscientist留言 | 贡献resolution
2010年6月1日 (二) 04:552010年6月1日 (二) 04:55版本的缩略图640 × 416(171 KB)HarDNox留言 | 贡献{{Information |Description={{en|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.<br/> [[:en:Category:lanthanid

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