維基百科

File:Rareearthoxides.jpg

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摘要

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

協議

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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Original upload log

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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現時2015年4月25號 (六) 11:38響2015年4月25號 (六) 11:38嘅縮圖版本1,200 × 780（573 KB）Materialscientistresolution
2010年6月1號 (二) 04:55響2010年6月1號 (二) 04:55嘅縮圖版本640 × 416（171 KB）HarDNox{{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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