Students measured the temp of water at different depths in Lake Michigan and found the temperatures varied. What is the independent variable?

Depth of lake

Explanation:

In simple words, The independent variable can be understood as the feature of a psychological investigation which is regulated or modified by investigators rather than by other factors. For instance, learning would have been the independent variable inside an investigation of the impact of studying on test results.

Thus, we can conclude that in the given case, depth of lake is the independent variable.

because the center-south is called the heart of the country