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- 1 An extension of low atmospheric pressure from the central regions of a low-pressure system into a zone where generally higher pressure prevails. The term ‘trough’ is also, and in accordance with this definition, applied to equatorward meanders of the flow of the upper westerly winds over middle latitudes.
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Aug 9, 2024 · Learn about the formation of glacial landforms from corries to troughs, along with examiner tips and worked examples for the AQA GCSE Geography exam.
In geology, a trough is a linear structural depression that extends laterally over a distance. Although it is less steep than a trench, a trough can be a narrow basin or a geologic rift. These features often form at the rim of tectonic plates.
These are valleys formed by the glacial processes of weathering, erosion and transportation. They have steep sides and flat floors. Unlike V-shaped river valleys, glacial troughs are straight as they have truncated any interlocking spurs which existed prior to glacial advance.
The formation of a glacial trough involves two processes abrasion and plucking. Abrasion is when pieces of debris in the glacier wear away at the rocks below, a bit like sandpaper. The...
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- Troughs and Fjord Formation
- Fjords
- Markers of Past Environments
The formation of such landforms occur over long geological timescales, from 10,000 years to over 100,000 years, and across multiple different glaciations . Troughs are also referred to as U-Shaped Valleys due to their parabolic shape with very steep sides, and flat bases . Their formation occurs through a combination of erosional processes includin...
At the previous terminal position of the glacier, where erosion is lower, and sediment can be deposited, a formation known as a glacial sill, submarine ridge or morainal shoalmay form. This forms a barrier between the mouth of a fjord and the fjord valley. As sea levels rise over time due to tectonic activity and glacial melt, the valley begins to ...
Not only do troughs and fjords act as evidence for past glaciation, they can also contain clues about past glacial processes, and responses to change . Examples of this includes scour marks or striations on the trough floor due to the entrainment and transport of plucked material at the base of a glacier [3,5]. Mega scale glacial lineations (MSGL)o...
May 28, 2023 · The equatorward region of any meander is called a trough (pronounced like “troff”) and is associated with low pressure or low geopotential height. The poleward portion of a meander is called a ridge , and has high pressure or height.
Oct 25, 2024 · glacial trough. A relatively straight, steep-sided, U-shaped valley that results from glacial erosion. Its cross profile approximates to a parabola, while its long profile is often irregular, with rock bars (riegel) and over-deepened rock basins being typical features.
