Turnover of water in temperate lakes during the spring and fall is made possible by which of the following?
A) warm, less dense water layered at the top
B) cold, more dense water layered at the bottom
C) a distinct thermocline between less dense warm water and cold, dense water
D) the changes in the density of water as seasonal temperatures change
E) currents generated by nektonic animals

Question

Quizplus · Accepted Answer

The turnover of water in temperate lakes during the spring and fall is made possible by changes in the density of water as seasonal temperatures change. As the temperature of the water changes in the spring and fall, the water becomes more mixed and less stratified, allowing nutrients and gases to move between the upper and lower layers. The other choices may affect the temperature and density of the water, but do not directly cause turnover.

Turnover of Water in Temperate Lakes During the Spring and Fall