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Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
The Black Hills is an isolated mountain range rising from the Great Plains of North America in western South Dakota and extending into Wyoming, United States. [3] Black Elk Peak, which rises to 7,242 feet (2,207 m), is the range's highest summit. [4] The name of the range in Lakota is Pahá Sápa. [5] It encompasses the Black Hills National Forest.
A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arisen from the same cause, usually an orogeny . [ 1 ]
The Himalayan range is one of the youngest mountain ranges on the planet and consists of uplifted sedimentary and metamorphic rock. [75]: 9,11 According to the modern theory of plate tectonics, it was formed as a result of a continental collision and orogeny along the convergent boundary between the India and Eurasian Plates. [76]
The Western Carpathians are an arc-shaped mountain range, the northern branch of the Alpine-Himalayan fold and thrust system called the Alpide belt, which evolved during the Alpine orogeny. In particular, their pre- Cenozoic evolution is very similar to that of the Eastern Alps , and they constitute a transition between the Eastern Alps and the ...
Uluru (Ayers Rock) is a large sandstone formation in Northern Territory, Australia.. Sedimentary rocks can be subdivided into four groups based on the processes responsible for their formation: clastic sedimentary rocks, biochemical (biogenic) sedimentary rocks, chemical sedimentary rocks, and a fourth category for "other" sedimentary rocks formed by impacts, volcanism, and other minor processes.
Uplift intensified and climaxed a few million years later early in the Eocene epoch when large thrust and reverse faults created small mountain ranges separated by subsiding sedimentary basins. One of the reverse faults, the north–south trending 10 miles (16 km) long Buck Mountain Fault, elevated what is today the central part of the Teton Range.
Mountains and hills can be characterized in several ways. Some mountains are volcanoes and can be characterized by the type of lava and eruptive history. Other mountains are shaped by glacial processes and can be characterized by their shape. Finally, many mountains can be characterized by the type of rock that make up their composition.