This geospatial animation shows sea level rising across the land bridge between Siberia and Alaska. During the last Glacial Maximum (~21,000 years ago), the Bering Land Bridge was a vast tundra plain connecting Asia and North America. At that time, the global sea level was 120 meters lower than it is today. Melting ice sheets and glaciers caused the sea level to rise and flood the land bridge. A QuickTime ... Full description.

This is the home page for a geomorphology course for upper level undergraduates and graduate students at the University of Wisconsin - Stevens Point. The site contains a syllabus, course goals and objectives, illustrated lecture notes, a course schedule and policies of the class. Topics covered include stream flow, karst landscapes, glacial landforms, soil properties and slope stability. Full description.

This site provides a searchable database of NASA's Earth science-related images, animations, and data visualizations. Categories include agriculture, atmosphere, biosphere, cryosphere, human dimensions, hydrosphere, land surface, oceans, and solid earth. Images may be browsed by subject, location, or satellite sensor. Each image is accompanied by a description, background information, and explanation ... Full description.