A lake can look still while water below the surface moves in different directions. Scientists got a rare glimpse of that hidden movement in August 1988, when they released green and red dyes into Twin West Lake in British Columbia. The experiment showed that wind across the surface did not simply push the whole lake in one direction. Instead, it helped create a layered circulation, with the central dye moving one way near the surface and being carried back in the opposite direction lower down.
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