Photo: John Rusk, Yosemite (Some rights reserved)
Rock = the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans
Headlines
Vintage UK illustrations of rocks and minerals repurposed as a cool poster – Boing Boing
Elsewhere on the Web
British and Exotic Mineralogy
Wikipedia
Rock (geology)
Pumice
Sedimentary_rock
Soapstone
Limestone
Travertine
Planeta