This would be very easy for kids to participate in. Just buy white carnations and add food coloring to the water in the tubes and watch the flowers change color. this would be very easy for high school and middle school kids.
Weather: Fill the cup with water. Put shaving cream on top for a cloud. Explain that when clouds get really heavy with water, it rains! Then put blue food coloring on top of the cloud, and watch it rain. WEATHER UNIT by jenniferET