This learning module examines the Earth's stores of fresh water and how the balance between stores of water in the oceans and in ice is changing. Students then investigate how a maximum sustainable amount of freshwater can be achieved by...

Understand fresh water ecosystems using this review guide.

Learn about Earth's fresh water supply,

An introduction and overview of freshwater wetland habitats.

An activity where students create a mobile that represent a freshwater ecosystem that appears in nature. Requires Adobe Reader [PDF].

Find out about the plants, animals, people, and location of freshwater wetland ecosystems.

When people talk about Tennessee products, they usually talk about crops like soybeans, minerals such as limestone, and man-made things such as cars. During this tour, we'll talk about something produced in the Volunteer State that many...

Brief overview of types of freshwater biomes and the plants that live in them, as well as adaptations that plants have made in order to survive there.

Locate glaciers and ice caps on a world map at this USGS site. Read about the formation of galciers and other interesting facts. Learn about the effects glaciers have on the landscape, and of their importance for our fresh water supplies.

Learn about the different sources of fresh water.

Have you ever been swimming at the beach and gotten some water in your mouth by mistake? Then you know that the ocean is very salty. Bodies of freshwater also contain some salt, but much less compared to oceans. In this experiment you...

In this science fair project you'll discover how to turn the ocean into a source of freshwater by using the power of the Sun, and the water cycle. You will ultimately find just how salinity affects this process.

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

Acting as part of the online exhibit for the Amazonia display at the National Zoo, this site explores freshwater stingrays and rays particular to the Amazon.

Everything you've ever wanted to know about vertebrate kidneys. Modules include Freshwater Vertebrates, Amphibians, Lizards and Snakes, Birds, Mammals, Marine Fishes. Resources can be used as classroom notes or supplemental materials.

Get acquainted with the alligator snapping turtle while browsing this animal guide from the Brookfield Zoo. Content includes quick facts and highlights on the appearance, habitat, social behaviors, and mating habits of the largest...

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

Describes the physical characteristics of Daphnia, their importance as a food source for freshwater fish, their diet, life cycle, and methods of reproduction. Offers tips for how to start and maintain a colony of Daphnia that can be used...

Pearl characteristics, differences between a cultured pearl and a shell-based pearl, and freshwater pearls are some of the topics featured on this page.

In this activity, students will see that a carrot slice sinks in fresh water and floats in saltwater. Considering the placement of the carrot slice in water and salt water, students will infer that the density of salt water must be...

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]

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...

Learn about lake and pond ecosystems. Find out about plants, animals, adaptations, and conservation efforts.