Freeze large blocks of icein trays without dividers (remember those?). Unmold and allow scouts to sprinkle salt on them. Observe the fantastic shapes produced by the uneven melting.
Create ice cube rivers. Make a sand mountain and place ice cubes on top. Watch the melted water make rivers down the side of the hills.
Create ice cube pictures on the hot sidewalk. Look at the design made by the melted cube on the walk.
