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.

This computer-based lesson provides information on ocean currents, circulation and atmospheric influences. Several sections cover "drift" studies, including the famous Nike Tennis Shoe study. Each segment provides relevant information and gives students questions to answer. Incorrect responses result in more information. This unit is part of an on-line course in general oceanography offered at San ... Full description.

Tropical Twisters explains how hurricanes are created, why they move, and the damage they can do. There is information on the Saffir-Simpson hurricane scale to rate intensity and destructive power; the wind, storm surge and flood damage due to hurricanes; how scientists use the Tropical Rainfall Measuring Mission to understand hurricane rainfall; and the Geostationary and Operational Environmental ... Full description.

In this article, The Why Files examines the possible finding of water ice on our Moon, and the implications for this discovery. The article discusses why scientists believe there is water on the Moon, how a neutron spectrometer picks up the unusual presence of hydrogen on the Moon which could indicate water, what scientists hope to use this water for, and where this water may have come from. A moon ... Full description.

These science bulletins from the American Museum of Natural History feature news on space science, astronomy, and astrophysics topics with in-depth feature stories about cutting-edge developments, weekly images from observatories around the world and in space, and and 'Astro Viz', a visualization of astronomical or astrophysical phenomena. Each story features a link to an educators' guide and links ... Full description.

This collection of lithographs includes downloadable, printable pictures and information about Earth and its Moon (including the famous 'blue marble' photo of Earth taken by the crew of Apollo 17), the other planets of the solar system, their moons, the sun, the Kuiper belt, and the Oort cloud. Full description.

The Sun-Earth Viewer is an experimental Flash-based viewer that allows visitors to zoom and pan live NASA solar and Earth images. In addition, it features video interviews with scientists and detailed scientific animations, extensive interactive sun-earth illustrations, and live interactive solar and aurora images. Full description.

This site provides a non-mathematical introduction to the magnetism of the Earth, the Sun, the planets and their environments, following an historical thread. It is also available in French, Spanish, and German. Full description.

This non-mathematical, self-contained exposition of studies of the Earth's magnetic environment in space covers such topics as magnetism, electrons, eons and plasmas, the radiation belt, the sun and the solar wind, exploring earthspace, the dynamic magnetosphere, auroras, and interplanetary field lines. Many of the topics introduce the user to the related physics and astronomy, and are thus a useful ... Full description.

This article describes the ongoing research on the possible presence of water on Jupiter's moon Europa. It includes satellite images of Europa, scientific illustrations, and extensive text. It also discusses similar research being done on Lake Vostok in Antarctica. It also offers a variety of related links. Full description.