Students drop 3 different size balls into sand from 3 differents heights and measure diameter and depth of crater. Then they use a "Spinner" to pick the height, which ball and a dice to determine approximately where in the box they are going to drop the ball. You will need to make the two spinners. Spinners like you find in a game - where you flick a stick and it spins around and lands on an answer. We used a popisicle stick and cardstock. For example, for size we made it so that the area was larger for the smaller objects (there are more smaller objects in the solar system therefore more impacts are going to be the smaller items). After students do that they then create a moonscape and record how this moonscape was created. Teams then switch positions and examine each others moonscapes. They then try to interpet how the moonscape was made.