Igneous rocks are found under and above the earth's surface and are formed by millions of years of solidifying. Learn more about ingenious rocks in this educational geology video.
Reviews the classification of igneous rocks by composition and cooling rate.
Not very many rocks are famous. A few are Plymouth Rock in Massachusetts, the Blarney Stone in Ireland, and Ayer's Rock in Australia.
The steep walls of Yosemite Valley are made of granite. A batholith born of subduction cooled deep in the crust.