A fracture or crack in a planet's surface caused by extension On some volcanoes, subsurface intrusions are concentrated in certain directions; this causes tension at the surface and also means that there will be more eruptions in these "rift zones "
Tall thin passage with or without a floor; a disagreement between members of the expedition
A large-scale crack in the earth's lithosphere, produced by the tensional forces of two plates (tectonic plates) or two slide masses (two sides of a Hawaiian volcano) collapsing in different directions More or less linear over dozens to hundreds of km, a rift zone usually has a narrow valley (up to a few km wide) at its summit Rift zones are associated with basaltic volcanism, and have associated shallow earthquakes which give a real-time record of the rifting activity While most rifts are underwater, along the mid-ocean spreading plate boundaries, some are exposed at the surface: Iceland, the Baikal Rift (Siberia), and the great African Rift Valley The rift zone seen in the USGS glossary, along the summit of Mauna Loa, is so full of erupted lavas that there is no topographic depression, but a slight ridge
A deep fracture or break, about 25-50 km (15-30 miles) wide, in the earth's crust, creating an elongated valley bounded by two or more faults. a valley with very steep sides, formed by the cracking and moving of the Earth's surface. Elongated trough formed by the subsidence of a segment of the Earth's crust between dip-slip, or normal, faults. Rift valleys are usually narrow and long and have a relatively flat floor. The sides drop away steeply in steps and terraces. Rift valleys are found on the continents and along the crests of oceanic ridges. They occur where two plates that make up the Earth's surface are separating (see plate tectonics). Submarine rift valleys are usually centres of seafloor spreading, where magma wells up from the mantle. The most extensive continental rift valleys are those of the East African Rift System; other notable examples include Russia's Baikal Rift Valley and Germany's Rhine Rift Valley
A geologic depression of southwest Asia and eastern Africa extending from the Jordan River valley to Mozambique. The region is marked by a series of faults caused by volcanic action. the Great Rift Valley a very deep, wide valley which is 3000 miles long and runs across most of East Africa and into southwest Asia. v. or Rift Valley or East African Rift System Rift system (see rift valley), extending from Jordan in the Middle East south to Mozambique in southern Africa. It is some 4,000 mi (6,400 km) long and averages 30-40 mi (48-64 km) wide. The rift has been forming for some 30 million years, as Africa and the Arabian Peninsula separate, and has produced such massifs as Kilimanjaro and Mount Kenya. The system's main branch, the Eastern Rift Valley, is occupied in the north by the Jordan River, the Dead Sea, and the Gulf of Aqaba. It continues south along the Red Sea to several lakes in Kenya. Less obvious in Tanzania, with its eastern rim eroded, it continues south to the Indian Ocean near Beira, Mozam. The western branch of the system, the Western Rift Valley, extends north from the northern end of Lake Malawi in an arc that includes lakes Rukwa, Tanganyika, Kivu, Edward, and Albert
the splitting apart of the earth's crust when it is stretched by tectonic activity Results in the downfaulting of blocks of crust and creation of flat-floored valleys or troughs known as rift valleys (e g , Virginia's Triassic lowlands)
The splitting of a continent, a feature seen in the East African Rift Valley today Rifting often results in the generation of large volumes due to the effect of decompression of underlying rocks which are close to their melting temperatures
a breach or split between two bodies due to rising hot spot activity within the mantle Continuous activity thins the lithospheric plate, causes normal and reverse dip-slip faulting and eventually separates the plate
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