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This activity promotes student understanding of some of the movements that take place when warmer water and cooler water interface, and how differences in densities, resulting from variations in temperature, set molecules of liquids and gases in motion. Resources needed for the investigation include a large clear plastic container, a thermometer, metric measuring cup, food coloring, water, and ice. The resource includes background information, teaching tips and questions to guide student discussion. This is chapter 9 of Meteorology: An Educator's Resource for Inquiry-Based Learning for Grades 5-9. The guide includes a discussion of learning science, the use of inquiry in the classroom, instructions for making simple weather instruments, and more than 20 weather investigations ranging from teacher-centered to guided and open inquiry investigations.