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.

Visitors can access general information on the greenhouse effect, how it works, and what impact human-produced emissions are having on the global climate. Materials presented here include discussions of the potential impacts of climate change, actions being taken to mitigate the effects, news articles and publications, tools for estimating emissions and calculating the benefits of reduction strategies, ... 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.

This learning system provides a variety of materials on Earth and space sciences, such as images, movies, animations, and data sets. Students, teachers, and the general public can access information on the sun and space weather, astronomy, our planet and solar system, current space missions, space-related mythology and art, and geology. For teachers, there are links to tools for navigating the site, ... Full description.

In this activity, students study the concept of atmospheric pressure and its role in generating winds and influencing day to day weather conditions. The activity consists of answering a set of questions by accessing keyword links to helper resources. Full description.

At this site, users can access weather and weather-related maps. Subjects include outdoor activities, health and safety, weather details, gardening weather, and links to "Maps of the Week". Full description.

The Convection And Moisture EXperiment (CAMEX) is a series of field research investigations sponsored by the Earth Science Enterprise of the National Aeronautics and Space Administration (NASA). CAMEX-3 collected data for research in tropical cyclone development, tracking, intensification, and landfalling impacts using NASA-funded aircraft and surface remote sensing instrumentation. At this site, ... Full description.

This set of activities can be performed in the classroom or outdoors. Students will learn about atmospheric moisture, cloud formation, and precipitation by building and using their own instruments, making clouds in a bottle, and creating artificial "rain". Each activity includes materials lists, instructions for teachers and students, concepts, and learnable skills. 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.

Students can study the development of hurricanes as they evolve through a life cycle from a cluster of thunderstorms to a tropical depression to a tropical storm and then to a full-fledged hurricane. The characteristic atmospheric pressures at each stage of development are presented, and images of each stage are included. Links to more detailed information are embedded in the text. Full description.