ophiolite
71Sial — or SiAl is also the name for the upper layer of the Earth s crust, which is also known as the continental crust because it is absent in the wide oceanic basins. This layer is made of rocks rich in silicates and aluminium minerals. When the sial… …
72Cedros Island — ( Isla de Cedros , island of cedars in Spanish, also called in English Cerros Island in former times) is a Mexican island in the Pacific Ocean.It is located off the west coast of the Mexican state of Baja California from which it is separated by… …
73Lherzolite — is a type of ultramafic igneous rock. It is a coarse grained rock consisting of 40 to 90% olivine along with significant orthopyroxene and lesser calcic chromium rich clinopyroxene. Minor minerals include chromium and aluminium spinels and… …
74Rock cycle — rocks do not remain in equilibrium and are forced to change as they encounter new environments. The rock cycle is an illustration that explains how the 3 rock types are related to each other and how processes change from one type to another over… …
75New Idria, California — New Idria grounds, 2004 New Idria was an unincorporated town in San Benito County, California. It is named after a now inoperative quicksilver mine of the same name. The mine itself was named in honor of the world s second largest quicksilver… …
76Coolac, New South Wales — Coolac New South Wales Coolac Hotel …
77Geology of Scotland — The geology of Scotland is unusually varied for a country of its size, with a large number of differing geological features. [Keay Keay (1994) op cit page 415.] There are three main geographical sub divisions: the Highlands and Islands is a… …
78Yilgarn Craton — The Yilgarn Craton is a large craton which constitutes the bulk of the Western Australian land mass. It is bounded by a mixture of sedimentary basins and Proterozoic fold and thrust belts. Zircon grains in the Jack Hills, Narryer Gneiss Terrane… …
79Geology of Australia — Australia is a continent situated on the Indo Australian Plate.The geology of Australia includes virtually all known rock types and from all geological time periods spanning over 3.8 billion years of the Earth s history. ComponentsAustralia s… …
80Troctolite — is a rare ultramafic intrusive rock type. It consists essentially of variable amounts of olivine and calcic plagioclase along with variable minor pyroxene. It thus is midway between peridotite and anorthosite.Troctolite is found in some… …
