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![]() | Cerro Piedra Bola, Jalisco State, Mexico by JPaulo on 10/8/2009 Naturally-formed stone balls, i.e. cannonball concretions and megaspherulites, have been at times mi(...) (Source) | |
![]() | Superman's Hideout by Coramoor on 9/20/2009 Crystal caves, courtesy of National Geographic :) (Source) | |
![]() | Tesselated Plates of Tasmania by Amy Carnes on 9/19/2009 Natural formed, flat-lying rock formations caused by erosion that occurs on very few ocean shores. | |