In this lesson, students explore the vital topic of water sources on Earth, learning about both natural and man-made sources. They discover that water is essential for life and understand where it comes from—rain, rivers, lakes, groundwater, glaciers, oceans, dams, and canals. The lesson explains the uses of water in daily life and emphasizes the importance of conserving this precious resource. Students also learn about the water cycle, the continuous natural process of water moving through evaporation, condensation, precipitation, and collection. An engaging hands-on activity, Making a Water Cycle in a Bag, allows students to visualize the water cycle in action, reinforcing their understanding of this important Earth system.