Volcanoes provide spectacular evidence that we are living on a dynamic planet, where land can be created or destroyed without regard to human structures or civilizations. This interactive resource adapted from the...

This fact sheet provides an overview of the gases emitted by volcanoes, which consist mostly of water vapor, carbon dioxide, and sulfur dioxide. Topics include reasons for studying them, potential hazards, methods for...

This is the homepage of the United States Geological Survey's (USGS) Yellowstone Volcano Observatory. It features news articles, monitoring information, status reports and information releases, and information on the...