This collection of animations, slideshows, and videos covers a variety of topics including National Aeronautics and Space Administration (NASA) space missions, earthquakes, tsunamis, and many others. There are also podcasts on a variety of space-related topics. Full description.

This is part of an ongoing project to model volcanic eruptions using a computer. There are links to over 100 other volcano websites, eruption photos from around the world, and volcanic animations, sounds, and movies. There is also an online publication of volcanic literature, reference materials on volcanic eruptions, a guide to volcanologists on the Internet, and safety information. This site also ... Full description.

The Public Broadcasting System (PBS) NOVA program, through interviews with civil engineers, flood survivors, and floodplain management officials, examines the Great Flood of 1993, probes the issues generated by the flooding, and explores what might be done to decrease future flood losses. Major rivers discussed are the Mississippi, Nile, and Yellow Rivers. There is an audio file to 'hear' floods, ... Full description.

This NOVA television broadcast examines the rare 'supertwister', an extreme tornado classed F4 or F5 on the Fujita scale. Two storms are discussed: the 1999 Oklahoma City tornado (F5) and the 2002 LaPlata, Maryland tornado (F4). Articles discuss the seemingly high incidence of tornadoes in the United States and the development of tornado forecasting. There is also an audio feature on storm tracking, ... Full description.

This is an introductory textbook on physical geography, published online. Topics include essentials of geography, biogeography, the Earth system, the atmosphere, weather systems, Earth materials and structure, tectonics, and many others. Many chapters include links to audio and video resources, and virtual field trips. Chapters conclude with a review and links to additional resources. An atlas provides ... Full description.

This site contains movie clips of amphibians, games and puzzles, wildlife pictures, and a section on the sights and sounds of nature. Information is provided on herpetology and the Schoolyard Treefrog Monitoring Project; manatees, nonindigenous aquatic species, and coral reefs; and research on Snail Kites, Apple Snails, Florida Tree Snails, and Roseate Spoonbills. There are Frequently Asked Questions ... Full description.

This Gallery offers an extensive selection of images, sound recordings, animations, and movies associated with the National Oceanic and Atmospheric Administration's expeditions. A set of links provides access to maps, photos of ocean-dwelling organisms, sound recordings, cultural and historic illustrations, research technology such as ships and submersibles, and photos of ocean explorers themselves. ... Full description.