The Stream Study provides a method to determine the water quality of a stream based on the collection and identification of stream-bottom macroinvertebrates. This is a multi-chapter activity designed for teachers, parents, and students. Specific sections of this site include the following: why it is important to study stream-bottom macroinvertebrates, identification of stream-bottom macroinvertebrates, ... Full description.

Part of the USGS Water Science for Schools site, this resource defines irrigation water use and includes several tables and maps showing water use by various irrigation systems, by state, by crop, and by percentage of fresh water available. Students and teachers can look at their state and see 1990 data for how much ground water and how much ground water and surface water is used for irrigation. Various ... Full description.

This site has something for everyone, from glaciologists to grade school students. It explores nearly all aspects of glaciers and includes data and science, facts, a gallery, and a glossary. Full description.

This document describes the functions and values of wetlands, and includes keywords and illustrations. Wetlands have received wastewater discharges from many different situations in the past, but only recently have they been recognized as potentially cost-efficient treatment systems. They can effectively remove or convert large quantities of pollutants from point sources (municipal and industrial ... Full description.

This site is maintained by the Digital Learning Center for Microbial Ecology. A Microbe Zoo and the Microbe of the Month are included. The site provides some background material on many different types of Microbes, in ponds, around the deep sea vents, and various other locations. Two water regions are represented on the site, although mention is made of several others. Full description.

Clouds comprise a wonderful focus for classroom study. They're ubiquitous, ever-changing, scientifically interesting and, most importantly for teachers, they're cheap. The material presented here includes sections on cloud formation, cloud types, cloud pictures, other cloud-related phenomena, and a glossary. Full description.

This cloud identification chart includes explanations. It was jointly produced by NASA and NOAA. Full description.

This NASA special publication is an overview of the Saturn system, and the continued exploration by the Cassini spacecraft and the Huygens probe. Full description.

For ecologists, the horseshoe crab is an important creature- a vastly adaptable organism that predates most species on the planet, with a lifecyle that is interlocked with other animals. Users can view information, photographs, and diagrams that explain the anatomy, range and habitat, lifecycle, ecological niche, reproductive cycle, and medical uses of the horseshoe crab. Full description.

WhaleTimes will take young users on an adventure to the ocean. This resource provides a wealth of information and pictures on popular sea life, such as whales, seals, sea lions, sharks, penguins, and walruses. It helps the user to find out how animals survive in the sea, what they eat, where they live and much more. There are several computer activities for young kids, and a list of books that focus ... Full description.