The information on this site indicates that the life cycle of a glacier is more eventful than it appears. The site allows students to follow the journey of a single snowflake as it takes a ride through a glacier, a process that can take as much as 30,000 years to complete. It can be viewed as an interactive slide show or a single page of text and illustrations. Full description.

This resource gives an impression of how immense our Universe is by starting with an image of the Earth and then zooming out to the furthest visible reaches of the Universe. Its goal is to show astronomical distances without scientific notation. Instead, it focuses on the large number of zeros that are in astronomical distances when we measure them with a familiar unit like the kilometer. The number ... Full description.

This United States Geological Survey (USGS) general interest publication presents a description of ground water in the U.S. This includes what ground water is, how it occurs, aquifers and wells, ground water quality and what affects it, and the state of U.S. ground water resources. Full description.

This Environment Canada fact sheet highlights information about groundwater. The sheet starts with the definition of groundwater and aquifers, then discusses the hydrologic cycle, groundwater quality, contamination, and protection. A bibliography lists resources for further study. Full description.

This on-line expedition focuses on the flow of ocean water along with its climatic impact and environmental consequences. Learning objectives include an awareness that ocean waters are constantly on the move, that ocean currents influence climate and living conditions for plants and animals, even on land, and that currents flow in complex patterns affected by wind, the water's salinity and heat content, ... 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.