Lunar explorers perform an experiment to understand the size of the craters on the surface of the moon. They layer flour, laundry detergent, and cocoa powder in a pan to model the lunar surface. They drop marbles from different heights and take measurements of the resulting impact on the material. Data tables, graphs, and analysis questions follow the procedure, making this a nearly complete scientific investigation. Introduce the activity by posing the question and having learners form hypotheses.