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Aribbon lake is a long and very deep, finger-shapedlake, usually found in aglacial trough.[1] As such, a ribbon lake is one of a number of glacial landscapes, includingarêtes,corries, rock lips, rock basins andterminal moraines.
Such a lake's formation begins when aglacier moves over an area containing alternate bands of hard and softbedrock. The sharp-edgedboulders that are picked up by the glacier and carried at the bottom of the glacier erode the softer rock more quickly by abrasion, thus creating a hollow called a rock basin. On either side of the rock basin, the more resistant rock is eroded less and these outcrops of harder rock are known as rock bars, which act as dams between which rainwater may accumulate after the retreat of theice age, filling up the rock basin and creating a ribbon lake.[1] A ribbon lake may also form behind a terminal or recessionalmoraine, both of which also act as dams, enabling water to accumulate behind them.[1]
A ribbon lake may also occur if a tributary glacier joins a main glacier. The increase in power can create a trough, which is filled with water from a river/meltwater to create a ribbon lake.[citation needed]
Examples of ribbon lakes includeWindermere, the largest natural lake inEngland;[1]Panguipulli Lake, in southernChile;[citation needed]Lake Washington, in the state ofWashington;[1]Lake Ruda Woda in northernPoland andLlyn Ogwen, in northwesternWales.[citation needed]
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