Water moves between the earth's surface and the atmosphere in a repeated pattern. This is called the water cycle or hydrologic cycle. The water cycle can also be thought of as the circulation and conservation of the earth's water because the earth has a fixed amount of water that is used and reused again and again by living organisms.
The following sites are a list of internet-based resources about the water cycle.
Water cycle information, hand-on activities, and questions for further consideration.
Water is the source of all life on earth.
A teaching module from the Live From Earth and Mars website.
Ground water is water that flows or seeps downward and saturates soil or rock, supplying springs and wells. The upper surface of the saturate zone is called the water table.
Water can be tremendously forceful. Water in motion can cause great changes in the appearance of the crustal plates.
Games, activities, experiments.
Find out what a watershed is.
Hands-on water activities.
The abundance of water on the earth is a unique feature that clearly distinguishes our planet from others in the solar system. Not a drop of liquid water can be found anywhere else in the solar system.
"If you surf, swim, ski or snowboard, you come into direct contact with the hydrosphere." You can learn more about the hydrosphere at this site and also click on the "Water Cycle" link from the main page.
Give Water A Hand is national watershed education program designed to involve young people in local environmental service projects.