What you need to do:
1. Make two piles of out of 10 books. These books will represent the layers of bed rock on the earths crust
2. Put the cardbord on top of the books
3. Arrange the toy car, Popsicle sticks, toy house, and twigs on the cardboard
4. Slowly remove one book at the bottom of one pile

What happend to the objects on the cardbord when the book is removed?