Pour the water and seltzer in the film can down the drain. Observe what happens. Ask students to predict the effect of wind and wave action on oil and water. They can simulate the ocean's behavior by blowing on and moving the water in the pie pan. Dip a feather in the oil.
Children can try the procedure using fresh water and then salt water.
In the chart below, the difference between any two cells that are next to each other in the same row is the same, and the difference between any two cells that are next to each other in the same column is the same. Crumple one piece of paper and keep the other straight. Hold them both up at arm's length and drop them. Gather all the strings together at the bottom. Hang a small paper clip there as a weight.