MATERIALS
          pail
        water
        large stone(3"wide)
        shallow plastic cup
        plastic wrap
        tape
        small stone(1"wide)

   Explore

        1. Add water to the pail untill it is 1/3 full.

        2. Put the large stone in the cup. Place cup in the center of the pail. The top of the cup must be lower than the top of the pail, but above the level of water.

        3.Cover the pail with the plastic wrap.Seal the plastic wrap to the sides of the pail with the tape.

        4. Gently place the small stone in the center of the plastic wrap. It should be directly  above the plastic cup.

        5. Put the pail in a warm sunny place. let the pail stay in a warm place for one or two days. Observe what happens inside the pail a few times each day. Record your observations.