When the upper epilimnion waters become cooler than the hypolimnion waters, and the surface water sinks while the deeper water rises is known as
A) intertidal zonation.
B) upwelling.
C) pelagic division.
D) overturn.
E) eutrophication.

Question

Quizplus · Accepted Answer

The process described in the question is known as lake overturn, which occurs when the temperature of the upper epilimnion waters become cooler than the hypolimnion waters during the autumnal cooling. This results in the surface water sinking and the deeper water rising, causing a mixing of the different water layers in a lake.

When the Upper Epilimnion Waters Become Cooler Than the Hypolimnion