This web site provides a written account of the October 8, 1965 San Francisco earthquake by the American author, Mark Twain. Full description.

This space and astronomy guide, from the University of Leicester, England, presents information on the Solar System, the nine planets, stars, galaxies (including the Milky Way), nebulae, comets, asteroids, meteorites, the universe, and space missions (such as the International Space Station and interplanetary probes). There is also information on some of the first astronauts and cosmonauts. The International ... Full description.

This Discovery Channel interactive feature allows users to go back in time and watch the North American continent change and its creatures evolve. The feature begins with a map from which users can select a location or time period and see what the dinosaurs and their habitats were like. Other features include "Meet The Old Neighbors", in which students can enter their ZIP codes and learn which dinosaurs ... Full description.

This National Park Service website offers descriptions of: the animal fossils found at this park, including the extinct Hagerman horse; the geology of the park which is mostly floodplain sediments of primarily silty clays; and the geological, hydrological, and hydrostratigraphical aspects of a landslide model. There are photos of park landslides, prehistoric projectile points, and the historical Oregon ... Full description.

This Discovery Channel feature offers an image gallery showing how perceptions of Tyrannosaurus rex' appearance have changed over time and a feature story discussing evidence suggesting that T.rex may have been a scavenger of the Late Cretaceous rather than a hunter. There is also information on paleontologist Jack Horner and his project at the Hell Creek Formation in Montana, with several videos ... Full description.

This single-page website introduces the concept of radar mapping, from planes or satellites, of the surface of the Earth despite cloud cover. It does so via an activity which involves attempting to determine the shape of an object inside a box into which one cannot see. Probes, such as knitting needles, are allowed as sensors. Full description.

This section of the Windows to the Universe web site provides information and images about space missions including detailed information about manned and unmanned spacecraft, satellites, history of missions, and tables listing missions. Windows to the Universe is a user-friendly learning system pertaining to the Earth and Space sciences. The objective of this project is to develop an innovative and ... Full description.

Animal Diversity Web (ADW) is an online database of animal natural history, distribution, classification, and conservation biology. It features descriptions of individual animal species which may include text (written by college students), pictures, photographs or movies of specimens, and/or recordings of sounds. Taxonomic descriptions above the species level, especially phyla, classes, and in some ... Full description.

Earth's orbit around the Sun, together with the tilt of its axis, results in periodic climate changes around the globe known as seasons. Different locations experience different types of climate changes. For example, some places have extreme seasonal changes in temperature, while others have little temperature change but may have rainy and dry seasons. This interactive feature explains why Earth experiences ... Full description.

This section of the Windows to the Universe web site provides information and images about understanding the sky including detailed information about the motion of planets, the motion of the Moon, Earth's motion, and seasons. Windows to the Universe is a user-friendly learning system pertaining to the Earth and Space sciences. The objective of this project is to develop an innovative and engaging ... Full description.