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2. Trough (geology) - Wikipedia

   en.wikipedia.org/wiki/Trough_(geology)

   Satellite image of the Cayman Trough Bathymetric features of the Rockall Trough northwest of Scotland and Ireland. 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 ...

3. Experiments and Observations on Different Kinds of Air

   en.wikipedia.org/wiki/Experiments_and...

   Pneumatic trough, glass collecting cylinders and other equipment used by Priestley in his experiments on gases. The right-hand cylinder exhibits a sprig of mint which showed that plants generated oxygen from carbon dioxide Dedication to Lord Shelburne in volume I of Experiments and Observations on Different Kinds of Air (1774)

4. Langmuir–Blodgett trough - Wikipedia

   en.wikipedia.org/wiki/Langmuir–Blodgett_trough

   A Langmuir–Blodgett trough (LB trough) is an item of laboratory apparatus that is used to compress monolayers of molecules on the surface of a given subphase (usually water) and to measure surface phenomena due to this compression. It can also be used to deposit single or multiple monolayers on a solid substrate.

5. Crest and trough - Wikipedia

   en.wikipedia.org/wiki/Crest_and_trough

   A trough is the opposite of a crest, so the minimum or lowest point of the wave. When the crests and troughs of two sine waves of equal amplitude and frequency intersect or collide, while being in phase with each other, the result is called constructive interference and the magnitudes double (above and below the line).

6. Ribbon lake - Wikipedia

   en.wikipedia.org/wiki/Ribbon_lake

   A ribbon lake is a long and very deep, finger-shaped lake, usually found in a glacial trough. [1] As such, a ribbon lake is one of a number of glacial landscapes, including arêtes, corries, rock lips, rock basins and terminal moraines. Such a lake's formation begins when a glacier moves over an area containing alternate bands of hard and soft ...

7. U-shaped valley - Wikipedia

   en.wikipedia.org/wiki/U-shaped_valley

   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 ...