Slippery Slopes and the Angle of Repose

Have you ever seen an avalanche or landslide roll down a hill? Why is it that at one moment, everything seems fine, then suddenly the mountain begins to slump? It has something to do with how the earth or snow is piled up on the mountain. In this teaching guide, you will create your own little avalanches and determine the angle of repose for different materials along the way!