Get expert answers to questions about volcanoes, seismology, pollution, minerals and gems, hydrology and sedimentary rocks.

Environmental-consulting firm provides articles and fact sheets about the dangers and health risks associated with chromium.

Discover the characteristics of planet Earth, including its orbit, composition, plate tectonics and atmosphere. Find related moon links.

Search for data gathered by remote sensing missions from spacecraft and aircraft. Examine science mission info or browse kids' sections.

Learn to view the Earth as a complex system of interacting components with this University of Florida online course.

Huge compendium of earth science data and models can be searched all at once or by topic.

Provides environmental information for risk-management reports, industry publications, news and market research. Download the report samples.

Comprehensive database from NASA covers earth science, the environment, the biosphere, and climatic change.

Browse an annotated directory from University of California at Berkeley for links to geographic surveys, statistics and data.

Zoom in on featured places across the globe with point-and-click technology and aerial photographs from Microsoft.

Provides details of how scientists use analytical chemistry obtain data on the earth's origins and makeup. Includes a text-only version.

Explore the University of Calgary index of earth-science organizations, events, resources, software and references.