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Geology Dictionary - contains thousands of geological terms with their definitions.

Geology Dictionary Geology Dictionary - contains thousands of geological terms with their definitions.

Geology is the study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them. It includes the study of organisms that have inhabited our planet.

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Geology Dictionary - contains thousands of geological terms with their definitions.

Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com

Gneiss is a foliated metamorphic rock in which the coarse mineral grains have been arranged into bands or layers of varying mineral composition.