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A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in ...
View of Monument Valley in Utah, looking south on U.S. Route 163 from 13 miles (21 km) north of the Utah–Arizona state line Mitchell Mesa from the View Hotel.. Monument Valley (Navajo: Tsé Biiʼ Ndzisgaii, pronounced [tsʰépìːʔ ǹtsɪ̀skɑ̀ìː], meaning "valley of the rocks") is a region of the Colorado Plateau characterized by a cluster of sandstone buttes, with the largest reaching ...
A rift valley near Quilotoa, Ecuador. The Ottawa-Bonnechere Graben Þingvallavatn. A rift valley is a linear shaped lowland between several highlands or mountain ranges produced by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may ...
Map of the Great Rift Valley. The Great Rift Valley (Swahili: Bonde la ufa) is a series of contiguous geographic depressions, approximately 6,000 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.
John Muir proposed that Yosemite Valley and Hetch Hetchy Valley were formed purely by glacial action. In 1930, François E. Matthes proposed a hybrid hypothesis, where most of the depth of the valley was gouged by water erosion, the rest by glacial action. The glacial action also claimed to have widened the valley.
U-shaped valley, also known as glaciated valley – Valleys formed by glacial scouring; Gully – Landform created by running water and/or mass movement eroding sharply into soil; Canyon, also known as Gorge – Deep chasm between cliffs; Valley – Low area between hills, often with a river running through it
A valley step (German: Talstufe or Talschwelle) is a prominent change in the longitudinal slope of a valley, mainly in trough valleys formed by glaciers. Typically, a valley formed by glaciers has a series of basins with intervening steps formed by the locally varying erosion depths of valley glaciers .
The Hetch Hetchy Valley began as a V-shaped river canyon cut out by the ancestral Tuolumne River. About one million years ago, the extensive Sherwin glaciation widened, deepened and straightened river valleys along the western slope of the Sierra Nevada, including Hetch Hetchy, Yosemite Valley, and Kings Canyon farther to the south. [12]