
In order of specificity, Rift Valley can refer to: ...
Found on
http://en.wikipedia.org/wiki/Rift_Valley

A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. A rift valley is formed on a divergent plate boundary, a crustal extension, a spreading apart of the surface, which is subsequently further deepened by the forces of erosion. When the tensional forces were strong...
Found on
http://en.wikipedia.org/wiki/Rift_valley

major branch of the East African Rift System (q.v.).
Found on
http://www.britannica.com/eb/a-z/r/49

any elongated trough formed by the subsidence of a segment of the Earth`s crust between dip-slip, or normal, faults. Such a fault is a fracture in ... [7 related articles]
Found on
http://www.britannica.com/eb/a-z/r/49

An elongated valley formed by the depression of a block of a planet's crust between two faults or groups of approximately parallel faults. As the faults move apart, the central area between them slips down. The friction produced by this slippage can cause earthquakes and also melt rock which is then...
Found on
http://www.daviddarling.info/encyclopedia/R/rift_valley.html

A fault trough formed in a divergence zone or other area of tension.
Found on
http://www.encyclo.co.uk/local/22392

1 A valley of regional extent formed by block faulting in which tensional stresses tend to pull the crust apart. Synonymous with graben. 2 The downdropped block along divergent plate margins.
Found on
http://www.evcforum.net/WebPages/Glossary_Geology.html

Steep sided valley found on the Earth's surface created by tectonic rifting.
Found on
http://www.physicalgeography.net/physgeoglos/r.html

A valley formed when the strip of land between two faults subsides.
Found on
http://www.quick-facts.co.uk/earth/glossary.html

A linear-shaped lowland between highlands or mountain ranges created by the action of a geologic rift or fault.
Found on
http://www.scientificpsychic.com/etc/geology-glossary.html

An elongated valley formed by the depression of a block of the planet's crust between two faults or groups of faults of approximately parallel strike.
Found on
http://www.solarviews.com/eng/terms.htm

[
n] - a valley with steep sides
Found on
http://www.webdictionary.co.uk/definition.php?query=rift%20valley
noun a valley with steep sides; formed by a rift in the earth`s crust
Found on
https://www.encyclo.co.uk/local/20974
Click images to enlargeValley formed by the subsidence of a block of the Earth's crust between two or more parallel faults. Rift valleys are steep-sided and form where the crust is being pulled apart, as at mid-ocean ridges, or in the Great Rift Valley of East Africa. In cross-section they can appear like ...
Found on
https://www.encyclo.co.uk/local/21221

a large valley between two sets of opposite-facing Normal faults, resulting from tension forces in the rocks. (e.g. E.African Rift).
Found on
https://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3451.h
No exact match found.