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Young Voices for the Planet DVD in our online store includes 8 films where students speak out and take action on climate change.


Do you see how the sediment that is collecting at the bottom of the California mountains in (A) looks like a fan from above? This is called an alluvial fan! Alluvial fans form when sediment eroded from mountains is deposited on a valley floor like in (A). The rocks that are formed from an alluvial fan have large pieces of sediment that are not very round like the sediment in (B).

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Courtesy of Martin Miller, University of Oregon and Earth Science World Imagebank
Last modified January 6, 2004 by Lisa Gardiner.

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TES XXVI, 3 fall 2010 The Fall 2010 issue of The Earth Scientist, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!

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