Our Swimming Creatures of the Sixth Day curriculum kicks off with information about the ocean itself, and one of the neat activities demonstrates how water temperature affects water movement.  Thermohaline currents are deep ocean currents, caused by temperature, or salt content or both.  In this experiment we were only working with water temperature. Our question:  Which is heavier – hot or cold water? Grace decided that hot water was heavier. The procedure is as follows:  First put a few drops of blue food coloring in a clear container of hot water.  Then put a few drops of yellow, in a cup of ice water.  Pierce the cup, … Continue reading How water temperature affects deep ocean currents…