Since landing on Mars in January 2004, Spirit and Opportunity, the Mars Exploration Rovers, have helped scientists learn an amazing amount about the red planet. The sophisticated rovers far exceeded expectations with the geological clues they have dug up about the planet's past. In this video tour of the rover landing sites, the mission's principal science investigator, Steve Squyres, describes some ... Full description.

This NOVA television broadcast discusses black holes and presents new research indicating that a supermassive black hole may lurk at the center of our own galaxy. Features include interviews with researchers who explain the basics of black holes and reveal why they think the Milky Way may harbor a gigantic black hole at its center, and audio clips of physicists and astronomers describing their ideas ... Full description.

Earth Gauge and the COMET Program have designed a two-hour course for that provides a basic overview of climate change science and resources to answer common questions about climate change. Although initially designed for broadcast meteorologists, the course is a good primer for anyone interested in climate change. Full description.

The UC San Diego Webshaker is a live earthquake experiment conducted over the internet. The user can select a historic earthquake or design an earthquake by specifying the frequency, amplitude, and duration. The shake table delivers base motion to the test structure in the same way that an earthquake shakes buildings and other structures. A live video broadcast and precise measurements from sensors ... Full description.

This site features seven PBS programs from around the world that explore the delicate relationship between humans and the natural environment, and the necessity of achieving a balance between the two. Programs contain both text and video, as well as links to other information sources. In addition to the seven programs, the site also features a photo gallery, definitions and information about global ... 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 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.

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 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 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.