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U-shaped valleys, also called trough valleys or glacial troughs, are formed by the process of glaciation. They are characteristic of mountain glaciation in particular. [ 1 ] They have a characteristic U shape in cross-section, with steep, straight sides and a flat or rounded bottom (by contrast, valleys carved by rivers tend to be V-shaped in ...
The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, roches moutonnées, overdeepenings and hanging valleys. Striations: grooves and indentations in rock outcrops, formed by the scraping of small sediments on the bottom of a glacier across the Earth's surface. The direction of ...
Glacial erosion often causes U-shaped valleys to form. [6] These valleys allow for directed water movement such as seen in glacial streams with meltwater. [6] Subglacial fluvial erosion and glacial outwash occurs from the melting of the glacier and creates water flow that can wear bedrock. [4]
By contrast with glacial U-shaped valleys, there is less downward and sideways erosion. The severe downslope denudation results in gently sloping valley sides; their transition to the actual valley bottom is unclear. Trough-shaped valleys occur mainly in periglacial regions and in tropical regions of variable wetness. Both climates are ...
An arête (/ ə ˈ r ɛ t / ə-RET; French:) [1] is a narrow ridge of rock that separates two valleys. It is typically formed when two glaciers erode parallel U-shaped valleys. Arêtes can also form when two glacial cirques erode headwards towards one another, although frequently this results in a saddle-shaped pass, called a col. [2]
New York's Finger Lakes.Lying south of Lake Ontario, the Finger Lakes formed in tunnel valleys. A tunnel valley is a U-shaped valley originally cut under the glacial ice near the margin of continental ice sheets such as that now covering Antarctica and formerly covering portions of all continents during past glacial ages. [1]
The human-made spaces that provide the setting for human activity, in which people live, work, and recreate on a day-to-day basis. burgh A type of administrative subdivision in Scotland and northern England, equivalent to a borough. burn In parts of the United Kingdom, Australia, and New Zealand, a large stream or a small river. See also bourne ...
Panorama of part of the Snowdon Massif including Snowdon (centre right) taken from Mynydd Mawr.The Glyderau are visible in the distance.. The bedrock geology of Snowdonia is largely formed from a sequence of sedimentary and igneous rocks originating during the early Palaeozoic (the Cambrian, Ordovician and Silurian periods, lasting between 539 and 419 million years ago).