Photo: Yosemite
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
Elsewhere on the Web
British and Exotic Mineralogy
Wikipedia
https://en.wikipedia.org/wiki/Rock_(geology)
https://en.wikipedia.org/wiki/Pumice
https://en.wikipedia.org/wiki/Sedimentary_rock
https://en.wikipedia.org/wiki/Soapstone
https://en.wikipedia.org/wiki/Limestone
https://en.wikipedia.org/wiki/Travertine
Planeta