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Image Credit
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Description:
Geology science project Ripples on a beach are an example of self-organizing structures left behind when sediment settles out of flowing water
Source:
Public domain
License:
Open source
Source URL:
http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Ripples_sand_and_wormcasts.jpg/450px-Ripples_sand_and_wormcasts.jpg
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