During our solar system unit we did a crater lab and the students went crazy for it! You need three containers, one for corn starch, one for sugar, and one for flour. In addition, you will need small and large marbles. Students drop the marbles from different heights and see how the surface composition affects the depth and width of the crater.
Once the marble is dropped, students record data and make observations. This lab is great for having students connect what they are learning about to real world science labs. Students can then make predictions about what the surface composition of the moon and Mercury are like based on their experiences with the lab.