Fließgleichgewicht

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Etwa so groß wie Deutschland: das Kaspische Meer: durch die Wolga und einige weniger andere Flüsse so wie etwas Regen gelangt Wasser in das Kaspische Meer. Durch Verdunstung verlässt Wasser das Meer. Solange die Menge des zufließenden Wasser gleich der Menge des verdunstenden oder sonstwie entweichenden Wassers ist, herrscht ein Fließgleichgewicht.

Originalbeschriftung: Measured by surface area, the Caspian Sea is the world’s largest inland water body. It covers roughly 371,000 square kilometers (143,200 square miles) and borders five countries. To the ancient Greeks and Persians, the lake’s immense size suggested it was an ocean, hence its name.

A large expanse of clear sky permitted an unobstructed view of the Caspian Sea in early June 2010. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image on June 4, 2010. The color of the Caspian Sea darkens from north to south, thanks to changes lake in depth and perhaps sediment and other runoff. The northern part of the lake is just 5 to 6 meters (16 to 20 feet) deep. The southern end, however, plunges more than 1,000 meters (3,300 feet).

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