(s) Students will be able to describe liquids in terms of their viscosity. Students will be able to explain how heat affects a liquid's viscosity. Students will understand how dissolved gas and pressure influence the behavior of an eruption. Materials Two empty film canisters (black with gray lid) Alka-seltzer tablets (about 30) Bunsen burner, hot plate, or camp stove (optional) A pot for water (optional) Balloons, smallest available (one per 2-3 kids) Means to fill balloons part-way with water A bottle of carbonated mineral water Thermometer Watch with second hand Several liquids with differe