This video segment, adapted from a NOVA broadcast, continues the broadcast 'Antarctic Ice Movement'. This portion explains the phenomenon of ice streams, areas of fast-moving ice flow, and shows a team of scientists seeking evidence to support their hypothesis that atmospheric warming, either now or in the past, may explain why water has formed beneath the ice sheet, creating a lubricating layer of ... Full description.

This video documents an experiment conducted in Kane Cave, Wyoming, to see if microbes that inhabit the cave could actually be contributing to the cave-formation process. Adapted from a NOVA broadcast, the segment is four minutes and twelve seconds in length. Full description.

Scientists have been looking for extra-solar planets for decades, but only recently, with better equipment and improved techniques, have they finally unveiled new and unusual planets. Since 1995, over 155 planets have been discovered orbiting stars other than our Sun. This video segment, adapted from a NOVA television broadcast, gives an account of the discovery of the first confirmed extra-solar ... Full description.

This video segment, adapted from a NOVA broadcast, shows how the members of an Antarctic research team cope with the inhospitable climate and other environmental hazards during their stay. The segment is five minutes four seconds in length. Full description.

The Moon, Earth's natural satellite, seems to hover in the sky, unaffected by gravity. With the right combination of speed and gravity, satellites can fall around, instead of into, the body that they orbit. This animated video shows how the Moon 'falls around', or orbits, the Earth. The segment is one minute thirty-six seconds in length. Full description.

This collection of movies covers topics in inroductory geology and sedimentology. Some subjects include the effect of groundwater on limestone, glacial features, the Centralia, Pennsylvania coal mine fire, carbonate sedmentation, and coral reefs. Full description.

Mammals, the class of animals that includes humans, currently thrive in many different environments and dominate Earth. However, the first mammals were small and rather insignificant compared to their contemporaries, the dinosaurs. This video segment, adapted from a NOVA television broadcast, explains how mammals flourished after the extinction of the dinosaurs, and speculates on what might have happened ... Full description.

At high altitudes, Earth's atmosphere is much thinner than it is at sea level. Mountain climbers trying to reach the highest peaks have to overcome a lack of oxygen. Mount Everest, the highest point in the world, seems to be at the limit of human capabilities. This video segment, adapted from a NOVA television broadcast, describes the symptoms of mountain sickness (oxygen deprivation) and shows how ... Full description.

The water cycle is the process that moves water around Earth. In this video segment, adapted from a ZOOM television broadcast, cast members use a homemade solar still to mimic the natural processes of evaporation and condensation, separating pure water from a saltwater mixture. The segment is three minutes thirty-two seconds in length. Full description.

This video explores the role of biogeochemical cycles in the formation of caves. It discusses a radical new theory that identifies sulfuric acid as a cave-forming agent. The video, adapted from a NOVA broadcast, identifies the source of the sulfuric acid, which, unlike carbonic acid, the typical cave-forming agent, does not readily form in nature. The segment is 5 minutes and forty seconds in length. ... Full description.