US Environmental Protection Agency
Epa: Thirstin's Water Cycle Activity [Pdf]
This resource presents a simple set of instructions for building a model of the water cycle in a lidded jar.
Museum of Science
Oceans Alive: The Water Planet
Check out this simple overview of the water cycle and learn how to build a model of the water cycle.
Science Education Resource Center at Carleton College
Serc: Lab 2: What's a Watershed?
Students build a physical model to simulate watershed features, then use Google Earth software to tie the model to a real place. By exploring several layers of map-based images and data, students learn the complexity of a watershed and...