PROBLEM: What causes the circulation of water in the oceans?

PREDICTION:

EXPERIMENT I.
MATERIALS: beakers, hot plate, hot and cold sea water, food coloring

PROCEDURE: Instructor has filled the beaker with hot sea water, pour some cold seawater (mixed with food coloring) slowly into the hot sea water. Draw what happens on the back of this paper.

Why does the water move this way?

EXPERIMENT II.
MATERIALS: heavy paper disk (with a hole punched in the center), medicine dropper, stick with a base (to hold paper in place)

PROCEDURE: Insert the nail through the paper disk until the paper rests flat on the base of the stick. Spin the disk of paper and at the same time that it is spinning, squeeze 1-2 drops of water near the center of the disk. Draw what happens. In what direction did the water go? Why? Spin the disk in the other direction. What happens?

CONCLUSION: What factors influence the movement of water?