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.

The Zion Natural History Association (ZNHA) is a non-profit organization established in 1931 to support education, research, publication and other programs for the benefit of Zion National Park, Cedar Breaks National Monument, and Pipe Spring National Monument. Visitors to this site can acess information about the scientific, educational, historical, and interpretive activities of the Association ... 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 allows users to browse Earth science-themed photographs including 3-D images, historic NASA photographs, and images from satellites and manned space missions. Full description.

This chapter on the formation of Karst topography discusses susceptible rock types, how dissolution occurs, and the general appearance of Karst landforms. Tables, maps, figures, and photographs of Karst landforms from around the world are included. It is part of 'Geomorphology from Space', an out-of-print publication of the National Aeronautics and Space Agency (NASA). 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.

This is an introduction to the concept of seafloor spreading proposed by Harry Hess in the early 1960's. This site offers multiple links to further examine this geologic hypothesis. Full description.

This collection of images was captured by the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar, which was flown on two flights of the space shuttle Endeavour in 1994. Images are classified into categories for ease in searching: archaeological sites, cities, ecology and agriculture, geology, interferometry, oceans, rivers, snow and ice, and volcanoes. Full description.