Nature Net encompasses five web sites that cover air quality, biology, geology, social science and water resources within the National Park Service. Each category includes general information, descriptions of programs and policies, scientific information, publications, educational resources and photographs. This site is a good starting point for research or information about the natural resources of our National Parks. This resource is part of the Biocomplexity collection. http://serc.carleton.edu/biocomplexity/ Educational levels: General public, High school, Intermediate elementary, Middle school, Undergraduate lower division