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Midcontinent Rift System. The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American Plate. It formed when the continent's core, the North American craton, began to split apart during the Mesoproterozoic era of the ...
A map of East Africa showing some of the historically active volcanoes (as red triangles) and the Afar Triangle (shaded at the center), which is a so-called triple junction (or triple point) where three plates are pulling away from one another: the Arabian Plate and two parts of the African Plate—the Nubian and Somali—splitting along the East African Rift Zone Main rift faults, plates ...
Great Rift Valley. The Great Rift Valley (Swahili: Bonde la ufa) is a series of contiguous geographic depressions, approximately 6000 or 7,000 kilometres (4,300 mi) in total length, the definition varying between sources, that runs from the southern Turkish Hatay Province in Asia, through the Red Sea, to Mozambique in Southeast Africa. [1][2 ...
The Rif or Riff (Tarifit: ⴰⵔⵔⵉⴼ, ⴰⵔⵉⴼ, romanized: Arrif, Arif, Arabic: الريف), also called Rif Mountains, is a geographic region in northern Morocco. It is bordered on the north by the Mediterranean Sea and Spain and on the west by the Atlantic Ocean, and is the homeland of the Rifians and the Jebala people. This ...
Riffians or Rifians (Berber languages: ⵉⵔⵉⴼⵉⵢⴻⵏ, romanized: Iriffiyen; singular: ⴰⵔⵉⴼⵉ, Ariffi, pronounced [iɾifijən, æɾifi]) are a Berber ethnic group originally from the Rif region of northeastern Morocco (includes the autonomous city of Spain, Melilla). [5] Communities of Riffian immigrants are also found in ...
The sedimentary layer of continental fragments can be up to 5 kilometres (3.1 mi) thick and can overlay two to three crustal layers. Continental fragments have an average crustal density of 2.81 g/cm 3 (0.102 lb/cu in) which is very similar to that of typical continental crust. Strike-slip fault zones cause the fragmentation of microcontinents.
The Rif War (Riffian: Amenghi 'n Arif, Spanish: Guerra del Rif) was an armed conflict fought from 1921 to 1926 between Spain (joined by France in 1924) and the Berber (Amazigh) tribes of the mountainous Rif region of northern Morocco. Led by Abd el-Krim, the Riffians at first inflicted several defeats on the Spanish forces by using guerrilla ...
Map of Pangaea with modern continental outlines. The supercontinent cycle is the quasi-periodic aggregation and dispersal of Earth's continental crust.There are varying opinions as to whether the amount of continental crust is increasing, decreasing, or staying about the same, but it is agreed that the Earth's crust is constantly being reconfigured.