What impact does a glacier have on rock? Objective Students will: • Infer what will happen if a jar filled with water is put in the freezer overnight. • Observe that as water freezes, it changes form, expands and produces force. • Relate how water expanding when it freezes, weathers rocks. • Identify moving ice as the primary component of a glacier. Background Read pages 49-52 in the Work House Program Unit 3: Climate Changes; Glaciers and Glaciation. This lesson is one unit of the Work House: A Glacier National Park Science and Indian Education Program. It can be completed as a stand alone le Duration: 60 Minutes Essential Question What impact does a glacier have on rock? Objective Students will: • Infer what will happen if a jar filled with water is put in the freezer overnight. • Observe that as water freezes, it changes form, expands and produces force. • Relate how water expanding when it free.