Other
Nrdc: Clean Water and Oceans
What prompted congress to pass the Clean Water Act? Has this legislation been successful? The Natural Resources Defense Council offers information on fresh and ocean waters, pollution control, conservation, and more.
Canadian Museum of Nature
Canadian Museum of Nature: Leeches
Leeches are found all over the world in both fresh and salt water, yet people tend to know little about them. Some facts and photos of these misunderstood creatures are found here.
The Wonder of Science
The Wonder of Science: 5 Ess2 2: Water Availability and Distribution
With these lessons, student can provide evidence to how water is distributed around Earth by interpreting graphs of the amounts and percentages of water in various reservoirs. On this site find work samples, phenomena, assessment...
US Geological Survey
Usgs: All of Earth's Water in a Single Sphere!
See how all of Earth's water compares to the total size of the Earth.
Curated OER
Unesco: Kazakhstan: Saryarka Steppe and Lakes of Northern Kazakhstan
Saryarka - Steppe and Lakes of Northern Kazakhstan comprises two protected areas: Naurzum State Nature Reserve and Korgalzhyn State Nature Reserve totalling 450,344 ha. It features wetlands of outstanding importance for migratory water...