This frequently-asked-questions feature provides answers about earthquakes, faults, plate tectonics, and earth structure. Maps and diagrams are provided with some answers, and links to additional information and to related topics are included. Full description.

This portal provides links to an extensive list of volcano-related websites for the United States and around the world. Users can access articles, maps, glossaries, webcams, a dictionary of volcanoes, and many other resources. Full description.

Users of this portal can access information on mountains, islands, and other landforms of the Earth. Links are provided to a variety of materials, including books, maps, atlases, photographs and imagery, games and quizzes. Full description.

This set of links provides users with access to a variety of lesson plans and activities about volcanoes. Full description.

Students may read and view pictures about how to become a volcanologist. Educational requirements and likely places where volcanologists may work are covered. Links to related sites are provided. Full description.

This webpage is part of NASA's Visible Earth, a searchable directory of images, visualizations, and animations of Earth. It features remotely sensed imagery of volcanic eruptions that display smoke plumes, lava flows, fires, and other eruptive features. Each image is accompanied by a caption describing the subject being illustrated and the satellite or instrument which captured the image. Files are ... Full description.

The most profound deformational event involving the interaction of lithospheric plates is a collision between continents; for example, the collision of the Indian continent with the Eurasian continent, which began in the Eocene. This continuing collision has produced intracontinental thrust sheets responsible for the highest mountains in the world. Mount Everest, the Annapurna Range, and the rest ... Full description.

Appalachian Mountain landforms clearly demonstrate the relation of plate tectonics and structure to geomorphology. The folded rocks record the convergence of two continental plates in Pennsylvanian/Permian time. This page uses text, maps, and remotely sensed imagery to explain the relationship between plate tectonics, geologic structures, and the resulting landforms. It is part of an out-of-print ... Full description.

The mental picture of the Appalachian Mountains most of us have is that of long linear ridges and valleys that form a belt some 25 to 100 km wide through Pennsylvania/Virginia/West Virginia and the Carolinas. With relief of 300 to 1000 m or more, these ridges stand out as distinct mountains. This page describes the general geomorphology and geology of the Appalachian Mountains with the use of text ... Full description.

This site consists of a digital total sediment thickness map and database for the world's oceans and marginal seas. The data are derived from previously published maps, ocean drilling results (Ocean Drilling Program and Deep Sea Drilling Project), and seismic reflection profiles (National Geophysical Data Center archives and Geological/Geophysical Atlas of the Pacific). Features include a JPEG image ... Full description.