This news article discusses data on Jupiter's moon Europa returned by NASA's Galileo and Voyager spacecraft and the possibility that an ocean of liquid water might exist on Europa and, with it, the possiblilty for extraterrestrial life. Full description.

This is part of the U.S. Geologic Survey's Water Science for Schools website. It consists of a set of links to other parts of the site dealing with groundwater-related topics such as groundwater flow and distribution, trends in groundwater use, importance of groundwater, and groundwater quality. Graphic illustrations and photographs are provided. Full description.

Geomorphology from Space is an out-of-print 1986 NASA publication designed for use by the remote sensing, science, and educational communities to study landforms and landscapes. Users can access a gallery of images consisting of 237 plates arranged by particular types of landforms such as tectonic, volcanic, planetary, and others. Photographs, locator maps, and sometimes a geologic map accompany the ... Full description.

This page describes El Nino and the Southern Oscillation and how they may contribute to severe weather and the destruction of sensitive ecosystems such as coral reefs. It features text, pictures, scientific illustrations, and links to satellite information and weather-related science activities. Full description.

These diagrams illustrate what a pressure gradient is and that air flows from regions of higher pressure to regions of lower pressure. Links to additional information are included. Full description.

This graph shows the general trend of changing ice volume on the Earth over the last 750,000 years. The extent of ice is estimated using changes in the amount of different isotopes of oxygen found in planktonic foraminifera which occur as fossils. Full description.

This poster shows how oceanic circulation helps to control global climate. In general, warm surface currents flow from the tropics to higher latitudes, driven mainly by winds and the Earth's rotation. Fast, warm surface currents like the Gulf Stream are concentrated at the western boundary of ocean basins. The poster is part of a collection of images associated with NASA Jet Propulsion Laboratory's ... Full description.

This is a JPEG image of the planets in the solar system arranged as a montage. It is part of the GRIN (Great Images in NASA) library of images, which consists of photographs and other illustrations that are browsable by subject, NASA Center, or keyword. Full description.

This document provides an overview of the TOPEX/Poseidon spacecraft and mission. Topics include a description of the satellite and its instruments, the cooperative effort of the joint U. S. - French mission, and how TOPEX/Poseidon performs its measurements. Illustrations of the spacecraft and a link to additional information are also provided. Full description.

In this module, students will learn the concept of atmospheric pressure, how it changes with height, and how it is represented on maps. It consists of a set of links to each concept. Links to additional material are embedded in the text. Full description.