This one demo serves to model several natural phenomena. To explain the observations requires understanding several interconnected scientific ideas. Particle motion, Kinetic Molecular Theory, Gas Laws, Air Pressure, Plate tectonics, Winds, fronts, air masses, and Density are all aspects of science knowledge I have related to this demo. What would you do with this? Please share your ideas in the comments.
To create this demo use a longish container filled with water. At one end put a heat lamp and put ice cubes in the other end. Allow the system to sit for a few minutes, then add food coloring to the ice cube side.