Mister Brown and Squeaks learn all about glaciers, and the clues they leave behind when they melt! Science and Engineering Practices: Developing and Using Models Disciplinary Core Ideas: ESS1.C: The History of Planet Earth - Some events happen very quickly; others occur very slowly, over a time period much longer than one can observe (2-ESS1-1). ESS2.A: Earth Materials and Systems - Wind and water can change the shape of the land (2-ESS2-1). ESS2.C: The Roles of Water in Earth’s Surface Processes - Water is found in the ocean, rivers, lakes, and ponds. Water exists as solid ice and in liquid form (2-ESS2-3). Performance Expectations: 2-ESS1-1 Use information from several sources to provide evidence that Earth events can occur quickly or slowly. 2-ESS2-1 Compare multiple solutions designed to slow or prevent wind or water from changing the shape of the land 2-ESS2-3 Obtain information to identify where water is found on Earth and that it can be solid or liquid