This Eisco Labs Comparative Terrain Landform Model Set includes two 23.5" × 18" cross-sectional, three-dimensional models for geological study. The full-color, hand-painted models show land evolution over time, with a removable overlay representing ancient mountain forms. Removing the mountain overlay reveals how terrain has changed through geological processes including erosion, deposition, and tectonic activity. These models are effective teaching tools for earth science courses, helping students visualize landscape evolution and the formation of geological features.