What FACTS ABOUT ROCKS do you know? They are abundant on earth, and yet little is known about them. These facts will increase your knowledge of the rocks.

The new model shows blobs within Earth's mantle where seismic waves travel slower than usual (blue), which suggests they may be subducted slab chunks. (Image credit: Sebastian Noe/ETH Zurich ...

The base of the Wisconsin Gas Building is made of Morton Gneiss, a metamorphic rock that exhibits a swirling, multicolored pattern. Quarried from Morton, Minnesota, this rock is made of ...

The basement geology consists of psammopelite, calc-silicate, diorite, pelitic gneiss and graphitic pelitic gneiss of the Daly Lake Group, accompanied by minor felsic orthogneisses. Foster Project ...

Over the years I have read some books on geology. After each reading, I think I understand the difference between sedimentary, igneous and metamorphic. But then knowledge slips away and I am left ...