The QuickTime videos in this section will help you understand the concept of lake turnover, which is an important part of every lake's ecosystem.

Lake turnover occurs twice a year and can take several days to several months depending on the size of the lake. In this experiment we will be looking at two variables: temperature (hot water vs. cold water) and salinity (salt water vs. fresh water). Those of you with a BellLIVE! 2000 curriculum can turn to page 93 to learn more about lake turnover by conducting some more fun experiments.

Let's begin!