Kick-start a discussion of the importance of biodiversity with a colorful resource that touts the benefits of maintaining healthy ecosystems. The images stress the interdependence of all the elements of an ecosystem.

This site is designed to assist the educator in teaching concepts and processes related to freshwater environments and to increase stewardship of these important resources. There are links to resources regarding the Great Lakes...

Take a look at sources of fresh water and methods to collect it, both natural and man made.

Water resources are under threat around the world. WorldWater.org is a repository of information related to issues that should concern all of us. There is also a searchable database of literature and research devoted to freshwater issues.

An historic agreement was signed to establish the largest freshwater reserve in the world, on the largest lake in the world, Lake Superior. This is Canada's first National Marine Conservation Area. Learn about this and the many species...

Kids learn about the freshwater aquatic biome. Ecosystems such as rivers, streams, ponds, lakes, wetlands, swamps, and bogs.

Article describing the scope of the problem of overfishing in the ocean and in fresh water bodies around the world. Adverse effects of this practice on both natural and human systems, and efforts to contain it are detailed. (Published:...

Critical source of freshwater and most abundant, yet also the most polluted is groundwater. Discover how scientists work to purify this important resource to make it useable.

Of course humans rely on freshwater for drinking and washing, but we also need it in great quantities to water crops and livestock for the food we consume. Understand the systems in place to purify and store groundwater to do this.

Identify the four types of seasonal wetlands found across the earth. There are fresh water and salt water marshes, bogs, and swamps.

Filled with printable pages of both plant and animal pond life, Enchanted Learning features fact sheets with color pictures.

A good source of information on aquariums, aquarium upkeep, and aquarium fish. Includes an index of freshwater and marine fish and invertebrates listed by type, Latin name, and common name. Index includes photos. Links to aquarium sites,...

Kids learn about the brook trout. What it looks like and eats. Where do they live in fresh water?

Explore water pollution in surface water and groundwater and investigate the treatments for both. Also, check out what happens when salt water infiltrates the fresh water sources.

This video segment from NOVA: "Sea Behind the Dunes" tracks the return of spawning alewife fish from the open ocean back to the freshwater streams and ponds where they were born. [3:34]

Learn about Canada?s wetlands, what they are and where they are located. Wetlands are divided into two classes: freshwater and saltwater. They are further separated into four main types: ponds, marshes, swamps, and peatbogs. Discover the...

Learn about estuaries, where the fresh water rivers meet the salt water of the oceans. The unique features of estuaries are explained, followed by a look into estuarine food webs. Next find out about the different plants and animals that...

Explore Florida's springs, some of the world's largest freshwater springs. Here is a well-done site that includes information about threats to these unique springs, natural and cultural history, Florida wildlife, underwater cave systems,...

Make learning about Earth's biomes fun and easy with video clips, photographs, and diagrams. Learn about estuaries, the water environments formed where freshwater from rivers or streams mix salt ocean water. [6:38]

Excellent, comprehensive site from National Geographic that provides lesson plans, activities, maps, and National Geography Standards. Teachers can find lesson plans based on grade and standard. Covers current issues, for example, global...

The Great Lakes include, Superior, Michigan, Huron, Erie and Ontario. These lakes form the largest fresh water system on earth and they are North America's greatest natural resource. Learn about the different lakes, how they formed,...

By testing your local water quality, you will be able to compare your results with students around the world. Register your class, and follow the project instructions. Additional teacher resources, references, and Ask-an-Expert sources...

This website offers in-depth information and photos on all living crocodilian species.

Travel with your students on a virtual field trip to learn about saltwater marshes!