earth's freshwater

National Geographic Education has produced Earth's Freshwater: A Guide for Teaching Freshwater in Grades 3 to 8. Chapter topics include:

1. Biodiversity in Freshwater
   
2. Water Cycle and Water Reservoirs
   
3. Changing Natural Flows of Water
   
4. Water Quality in Freshwater Systems
   
5. Water Concerns for Wildlife and Humans
   
6. Water and Human Communities
   
7. Water Solutions for Our Future
   

The full teacher guide is available for download. Videos accompany each chapter, also.