Cracking the Ice Age

This web site is part of NOVA online from the Public Broadcasting System (PBS). It examines earth and atmospheric topics with a focus on historical and present climates, ice ages, glaciers, climactic change, Wilson cycles, the greenhouse effect, carbon dioxide, chlorofluorocarbons, plate tectonics, and Alfred Wegener. Tutorials are entitled: Big Chill, Greenhouse - Green Planet, Hot Science: Continents on the Move, and Related Links. Each topic has a brief report and includes scientific illustrations. Educational levels: Graduate or professional, High school, Informal education, Intermediate elementary, Middle school, Undergraduate lower division, Undergraduate upper division