 Here's a way to help a child learn about sinking and floating. You can fill a large bowl with water, and the child can find some things to test, such as a stick, a leaf, a spoon, and a rock. Have them choose an object and ask them, do you think it will float or sink? After they guess, they can place it in the water and see what happens. Then you can do the same thing with the other objects. This activity helps the child develop their skills of predicting and making observations.