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Eine Geophysikerin liest Messwerte von einem Gravimeter (Gravitationsmessgerät) ab. Aus den Daten lassen sich Rückschlüsse auf Masse in der Nähe des Messgerätes ziehen (Gravitationsgesetz), hier etwa: wie viel Wasser fließt durch den Fluss.

Geophysicist Elske de Zeeuw-van Dalfsen (Royal Netherlands Meteorological Institute) collects a gravity reading from a station near Gibbon Falls in Yellowstone National Park. Gravity data collection was completed under Yellowstone National Park research permit 7074.

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