A site with a collection of science experiments for kids to perform and learn about testing stream/creek water to discover what kind of organisms, pH, minerals, etc. are present in their water supply. Includes a number...

The site, hosted by HowStuffWorks.com, describes the concepts of how air conditioners work through explanations and diagrams.

This is the home page of the Bureau of Reclamation, Managing Water in the American West. Contains numerous links and information to other Department of the Interior web sites and other water/land resources.

Visitors to this site can find a variety of materials on forestry and forest products in California. Teachers can access information on forest tours, a touring exhibit, posters, activities, and links to other forestry...

US Environmental Protection Agency presents this Advanced Notice of Proposed Rulemaking (ANPRM) on the Clean Water Act definition of "Waters of the United States," which has important ramifications for wetland...