Features on Mars that resemble dry riverbeds and the discovery of minerals that form in the presence of water indicate that Mars once had a thicker atmosphere and was warm enough for liquid water to flow on the surface.
Stream bed, the channel bottom of a stream or river or creek
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In geology, Baer's law, named after Karl Ernst von Baer, hypothesises that, because of the rotation of the earth, in the Northern Hemisphere, erosion occurs mostly on the right banks of rivers and in the Southern Hemisphere on the left banks.
The Širvinta is distinctive for its rapid flow and winding rocky bed, which is enjoyed by kayak enthusiasts.