granitic magma
41Glossary of geology terms — Here is a glossary of Geological terms.A*Abyssal plain Flat or very gently sloping areas of the deep ocean basin floor. *Absolute dating the process of determining a specific date (in years or some other unit of time) for an archaeological,… …
42Pilbara craton — The Pilbara craton (the Pilbara province in northwest Western Australia), along with the Kaapvaal craton (the Kaapvaal province of South Africa) are the only remaining areas of pristine Archaean 3.6 2.7 Ga crust on Earth. Similarities of their… …
43Alaskan mountains — ▪ mountains, United States Introduction three principal mountain groups the Brooks Range, Alaska Range, and Aleutian Range found in Alaska. The mountain ranges of Alaska give their state a rugged and beautiful terrain across its entire… …
44Dharwar craton — The Dharwar craton in South India presents a natural cross section of late Archaean continental crust. There are three main structural zones: a root zone of highly heterogeneous petrology (from monzonite to granite) and texture (phenocryst… …
45mountain — mountainless, adj. /mown tn/, n. 1. a natural elevation of the earth s surface rising more or less abruptly to a summit, and attaining an altitude greater than that of a hill, usually greater than 2000 ft. (610 m). 2. a large mass of something… …
46Kaapvaal craton — The Kaapvaal craton (Limpopo province of South Africa), along with the Pilbara craton of Western Australia, are the only remaining areas of pristine 3.6 2.5 Ga crust on Earth. Similarities of rock records from both these cratons, especially of… …
47Orbicular granite — Igneous Rock Polished rock sample of orbicular granite from Mount Magnet, Western Australia. Composition …
48Rubidium — krypton ← rubidium → strontium K ↑ Rb ↓ …
49Yellowstone hotspot — Schematic of the hotspot and the Yellowstone Caldera Location of the hotspot in …
50Napoleonite — Napoleonite, also called corsite because the stone is found in the island of Corsica, is a variety of diorite which is characterized by orbicular structure. The grey matrix of the stone has the normal appearance of a diorite, but contains many… …
