This site offers information on many aspects of water, including text, pictures, data, maps, and an interactive center where users can offer opinions and test their water knowledge. Main topics include: water basics, Earth's water, water use, and special topics such as acid rain, saline water and other water-quality issues. Links to other water-related sites are also provided. Full description.

GLOBE (Global Learning and Observation to Benefit the Environment) is a worldwide, hands-on, primary and secondary school-based science education program. Students can learn to take scientific measurements in the fields of atmospheric science, hydrology, soils, and land cover. They can report their data through the internet, create maps and graphs to analyze the data, and collaborate with scientists ... Full description.