Follow the adventures of a single raindrop character through the water cycle. The text is written at an appropriate level for primary students, and the illustrations will be compelling for young learners. A diagram the last page serves as a review of the raindrop's travels. Full description.

Ships travelling between Lake Ontario and Lake Erie use the Welland Canal. Beginning with a conversation between characters Mathise, Geo, and Trig, they explain how a lock in the canal operates by gravity alone, without pumps. The characters use mathematics to solve problems such as how long the locks take to fill and how to express the volume and flow of water in more common terms (bathtubs of water ... Full description.

This site provides a discussion of the downward movement, or infiltration, of water from the surface into soil or porous rock. Graphics illustrate the processes affecting infiltration, including precipitation, soil characteristics and saturation, land cover, slope, and evapotranspiration. Links to additional sources of information are also provided. Full description.

Segments on Rivers & Streams, Ponds & Lakes, and Wetlands provide information, photos, and graphics related to fresh water resources. The site provides information related to the geology and biology of these ecosystems and some information on technology as well. Each segment provides links to additional resources related to that topic. Students could readily use the site as a resource for ... Full description.

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.

A Texas-based task force produced this website as a public outreach and education tool about urban storm water runoff. A kids section provides games, fun facts, illustrations, and frequently asked questions. A public section offers downloadable education brochures on pesticides, fertilizers, storm water quality, and reporting illicit activity. The professional section provides handbooks and guidelines ... Full description.

February 2nd of each year is World Wetlands Day, which marks the date of the signing of the Convention on Wetlands in 1971, in the Iranian city of Ramsar on the shores of the Caspian Sea. As part of the observance, the Ramsar Convention makes available to order a variety of materials such as posters, leaflets, logos and stickers, and a video. Many of these materials are available in French and Spanish. ... Full description.

With three levels to choose from on each page - beginner, intermediate or advanced - this site provides a good introduction to the structure of the ocean. Included are excellent graphics and text about patterns of ocean salinity and temperature with depth, as well as surface currents, deep ocean circulation and even the water cycle. Extensive in-text links provide the means for users to explore the ... Full description.

Materials presented here outline basic concepts related to groundwater, answering questions like "What is groundwater?" and "What is an aquifer?" More detailed topics include groundwater quality, sources of contamination, engineering problems presented by groundwater, and safeguards to the groundwater supply. A bibliography and links to other water-related sites are included. A French translation ... 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.