These lecture notes present a discussion of mineralogical classification of granitic rocks, definitions of hypersolvus and subsolvus granites, tectonic and chemical classification, and depth of emplacement of granites. Other topics include pegmatites, continental rhyolites, origin of large volumes of silicic magma, continental flood basalts, continental rift valleys, evolution of rock suites, and ... Full description.

This interactive from NOVA Online provides a detailed look at the inner workings of one of the world's most dangerous volcanoes, Nyiragongo in the Democratic Republic of Congo. Users can click on highlighted points on a crossection of the volcano to see photos and read about its features and eruptive products. Full description.

This portal provides access to educational materials produced by the Cascades Volcano Observatory. The items include news and current events, information on current activity of the Cascades volcanoes, and emergency information in the event of an eruption. There are also frequently-asked-questions features, a glossary, and links to reading materials such as fact sheets and reports of the United States ... Full description.

This site has a lesson plan for a class activity on mountain building and graben and horst formation. This particular lesson is number 14, at the top of the page. There are a few other geology lesson plans also listed on this site. Full description.

This web page describes the history and hazards related to the Mount Hood volcano in Oregon. Issues discussed include past eruptive behavior, past catastrophic events, hazardous areas and tephra hazards. Included are a block diagram of tectonic plates and a simplified volcano hazards zone map for the area around Mount Hood. Full description.

This Why Files article explores volcanoes and volcanic eruptions. Topics covered include: Alaska's Pavlof and its threat to jet engines; Mexico City's restless neighbor, Popocatepetl (El Popo); underground volcanic processes; modern forecasting of eruptions; various volcanic phenomena and features; large flood basalt areas around the world; California's volcanically active area, Long Valley Caldera ... Full description.

This article, entitled Mountains of Fire, describes the relationship between the types of volcanic activity and plate movement and the connection between types of volcanoes and how they erupt. The article is supported by a video of an erupting volcano, a photograph of an eruption and an animation depicting pyroclastic flow and the formation of a composite volcano. It is also supported by three sidebars, ... Full description.

This resource defines and describes composite volcanoes, stratovolcanoes, subduction-zone volcanoes and composite cones. The information is from different sources and therefore the site gives a broad picture of these forms. The shape of the volcano is described as a function of the type and frequency of eruption and its proximity to plate boundaries. Full description.

This United States Geological Survey (USGS) fact sheet summarizes historical data (from 1760 to 1999) on 41 Alaskan volcanoes, using information drawn from the more thorough and comprehensive USGS Open-File Report 98-582. Summaries include the volcano type, location (latitude and longitude), location on USGS quadrangle map, and any information available about the dates of eruptions and type of volcanic ... Full description.

This article, from Earth: Inside and Out, provides insight into what scientists are learning about Mt. Rainier's volcanic past and future. It provides an overview of the nature of the work of Tom Sisson as a mountaineer and geologist with the Volcano Hazards Program at the United States Geological Survey, and the on-the-job hazards he faces. It explains how Sisson is creating a three-dimensional map ... Full description.