It Breaks Me Up

You have been learning how wind and water can break rocks into smaller pieces in a process called weathering. It takes a long time for wind and water to weather rocks. In this activity, you and your family members can observe how temperature plays a role in the weathering of rocks.


A boy at a kitchen table, a woman is taking a sack from the freezer.


Ask an adult to help you moisten two lumps of modeling clay. Wrap each model “rock” in plastic wrap. Place one in a freezer overnight. Leave the other one in a room. The next day, unwrap each “rock.” Compare them.


How are the model rocks different? What do you think caused the difference? What do you think would happen if you put the model rock back into the freezer for a second night?