Students set up three demonstrations to observe the properties of water. They explore the boiling point of water, the freezing point of water, and the ability of water to store heat.

Here you can learn all about salt water crocodiles. What makes them different than fresh water crocodiles? Where are they found? What kind of habitat do they live in?

Compare the freshwater stickleback with its saltwater relative and trace the evolutionary changes of the fish. Includes a lecture by Dr. David Kingley, as well as an animation showing the evolution of the stickleback in an Alaskan lake.

A video and a short multiple-choice quiz on the topic of aquatic ecosystems. It discusses the difference between freshwater and saltwater ecosystems, then explains what the three ecozones are in a marine ecosystem.

An experiment to test what happens when ocean water hits a freshwater estuary. Each step is demonstrated with photographs and the difference between salinity and density is explained.

Try these five multiple-choice questions about aquatic ecosystems. After answers are submitted, students can review their mistakes.

Homepage for the massive wetlands restoration project in San Francisco Bay. History, objectives, and benefits of the project are described.

Brief video lecture discusses the importance of water as a critical life resource. [2:53] Additional video explores the human side of the story with the resulting global implications. [2:44]

This lesson plan is designed to teach young children about healthy and hazardous marine and freshwater environments and be able to describe the effects of the pollution of plastics on wildlife.

Students perform an experiment comparing the impacts of CO2 on salt water and on fresh water. In a short demonstration, students examine how distilled water and seawater are affected differently by increasing carbon dioxide in the air.

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

Learn about all of Florida's state symbols on this colorful page. Click on the symbol for a larger picture and more information.

Illustrated tutorial explains estuary ecosystems. Animations and illustrations help students become more familiar with the plant and animal communities which make up this coastal habitat.

Find a wealth of information about the New Hampshire state symbols. Click on each word to be taken to a page with a picture, information, and links to much more about the symbol. Includes year of adoption.

A list of all of the state emblems and symbols for the state of Alabama. Clicking on the underlined link will bring up a picture of the symbol or emblem.

Students investigate the effects of salinity on the formation of sea ice, and whether salt water freezes more quickly or more slowly than fresh water.

This article describes the effects of polar ice caps on the Earth and offers explanations as to the possible effects of polar ice melting on sea level and temperature.

This site from the Environmental Education for Kids contains colorful and detailed information on water resources. Site covers fascinating tips and facts, as well as engaging quizzes on the wonderful world of water. Best suited for...

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.

Do you need information about Alabama? Find facts, a map, and state symbols. Pictures of many of the state symbols are included.

See how all of Earth's water compares to the total size of the Earth.