Become the ruler of your own little world! Curious kids ages 7-12 assemble a closed ecosystem in a soda bottle, then observe and learn about the water cycle, plant life cycles and more. By Earth Day you might know: Will the water you flush today land on your Grandma's tomatoes in Illinois? Registration begins Monday, March 31. This program was supported with funds granted by the Arizona State Library, Archives, and Public Records Agency, a division of the Arizona Secretary of State, under the Library Services and Technology Act, which is administered by the Institute of Museum and Library Services.