Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either sedimentary or igneous rocks. They are often foliated with lighter and darker bands that may be folded or faulted | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5925 px × 3260 px |
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