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.

Watersheds are those land areas that catch rain or snow and drain to specific marshes, streams, rivers, lakes, or to ground water. This site allows users to locate their watershed by city, county, state, or region. Links provide information about stream flow, water use, conservation efforts, demographics, forest riparian habitats, science in your watershed, water discharges, and assessment of watershed ... Full description.

This tutorial explains how satellite images are taken, transmitted to Earth, and converted into viewable form. Descriptions of each phase of the process are included: capture and transmittal of the image by a satellite or spacecraft, receiving the signal at one of the Deep Space Network's antennas, and processing the data into an image at the Jet Propulsion Laboratory's Multimission Image Processing ... Full description.

This tutorial provides instruction in algebra and trigonometry. Although intended as a refresher, it should be understandable to students who are new to the material as well as provide new insights to those who are already familiar with it. Full description.

Visitors can learn about the IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) spacecraft, instruments, and mission. Materials include news articles, photos, animations, documentation, and datasets. For educators, there is the IMAGE Public Outreach, Education, Teaching and Reaching Youth (POETRY) site, which provides teachers, students and the interested public with the latest information ... Full description.

Students can learn about the conditions necessary for hurricanes to form and sustain themselves. The discussion is accompanied by remote imagery and an animation showing how wind shear can retard the development of a hurricane. Links to more detailed information are embedded in the text. Full description.

This tutorial introduces students to the concepts of electromagnetic waves, wavelength, and the electromagnetic spectrum. Diagrams and written descriptions explain how wavelength is measured and explore the traditional divisions of the spectrum: radio, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Full description.

Visitors to this site can learn about the theory of plate tectonics, the history of its development, and the mechanisms that drive the formation, movement, and destruction of continents and tectonic plates. A selection of animations depicts the movements of crustal plates and continents through time. Each animation is accompanied by an interactive time scale that provides links to descriptions of ... Full description.

This collection of basic definitions and answers to questions about hurricanes and tropical cyclones includes how they form, how they are named, how intensities are measured, and how storms are forecast. Historical information, information on myths surrounding these storms, links to sites displaying real-time storm information, and safety tips are also included. Full description.