One of the most exciting science units in 5th grade is “ Ecosystems”. Students construct an enclosed mini ecosystem and learn about dependent and interdependent relationships, the water cycle and pollution among many other related scientific concepts. Each ecocolumn is constructed using 3, clear, 2-liter soda bottles. We are in need of many of these soda bottles for this year. Please clean them out with water ONLY. Send them on to any fifth grade teacher. Thanks!