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 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 portal provides links to a large number of population-related websites for the United States and around the world. Users can access information on most of the world's countries, major metropolitan areas, U.S. Census data, immigration data, and many others. Full description.

Users of this interactive world atlas can navigate to the desired continent or country and produce maps in either GIF or PDF formats, which are suitable for printing or copying. The atlas is produced by National Geographic Magazine's "Xpeditions" program, an endeavor to introduce geography into the classroom. Full description.

Users of this reference can access extensive information on each country, including maps, geographic data, environmental problems, and economic data. The factbook is searchable by country or by keyword. Full description.

Users can choose from a large variety of maps for viewing, downloading, and/or printing. A set of quick links is provided to maps of current or general interest, and the remaining collection can be searched by country, continent, region, or theme. Links to other map sites are provided. Full description.

This service allows users to locate, use, and share environmental information about watersheds where they live. Individual watersheds can be searched by map, place name, or Zip code. "Adopt your watershed" encourages individuals to become involved in stewardship and conservation of watersheds where they live. An environmental website database contains hundreds of URLs and can be searched by state, ... Full description.

This collection of images was acquired by astronauts as they flew various missions on the space shuttle and the International Space station. The collection is searchable by geographic location (an interactive map), landforms, human-created features, weather phenomena, water habitats, and others. The images are available in three resolutions and include cataloging data and a caption. Full description.