First, the class drew a sky in the upper half of the plastic bag and included clouds and the sun since they are important parts of the water cycle. Next, they added a couple of drops of blue food coloring to a cup of regular tap water and poured it into their bags. Then, they picked a window that got a lot of sunshine for best results. By hanging the water cycle bag in direct sunlight we were able to see water evaporate and condense into tiny droplets. When the droplets became bigger, they ran down the side of the bag like rain. The water pooled again at the bottom of the bag like it does with lakes and oceans.
Students used a Ziploc bag, permanent marker, water, blue food coloring and clear tape for this activity.
