Earth science teaches know how frustrating it can be to spend hundreds of dollars on three-dimensional (3-D) models of Earth’s geologic features, only to use the models for a few class periods. To avoid emptying an already limited science budget, teachers can use a simple alternative to the expensive 3-D models—sand. Modeling geologic processes and features with sand is an effective way for teachers to promote student understanding of Earth science topics, quickly assess students’ prior knowledge, and identify common misconceptions.