This activity I have done with children from 3 years old. To carry out the activity we need:

- large containers

- piece of wood

- plastic car

- cork

- sand

- stone

-paper

- any material you want.

We filled he containers  with water and put it in he center of the table. We put the kids around the able and we showing them the differents objects. We introduce the objects one by one into the water and see what happens. Then in assembly we talked about what we have seen