Terrariums are miniature gardens grown inside covered clear containers. Use them as a low-maintenance way to enhance your indoor environment, or as a way to teach kids about the water cycle as they witness the fascinating succession of evaporation, condensation, and precipitation in their mini-environment.
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.