During the summer, temperatures and plankton activity in temperate lakes are highest in the _______. This is also the period of _______ lake stratification.
A) epilimnion; highest
B) epilimnion; lowest
C) thermocline; highest
D) thermocline; lowest

Question

Quizplus · Accepted Answer

During the summer, temperatures and plankton activity in temperate lakes are highest in the epilimnion, which is the upper layer of the lake that is warmed by the sun. This is also the period of highest lake stratification, when the lake is divided into three layers: the epilimnion, the thermocline (a middle layer with a rapid temperature change), and the hypolimnion (the bottom layer).

During the Summer, Temperatures and Plankton Activity in Temperate Lakes