In its 4.5 billion-year history, the earth has undergone a great number of changes. Trace the evolution of the earth, peek deep inside at the varied layers, and examine how climate affects regions over time.

Takes young viewers on an introductory tour of the earth, exploring its many formations and processes. Video field trips to geologic locations help students gain additional insight, while a hands-on experiment or demonstration further illustrates key concepts.

Takes young viewers on an introductory tour of the earth, exploring its many formations and processes. Video field trips to geologic locations help students gain additional insight, while a hands-on experiment or demonstration further illustrates key concepts.

Takes young viewers on an introductory tour of the earth, exploring its many formations and processes. Video field trips to geologic locations help students gain additional insight, while a hands-on experiment or demonstration further illustrates key concepts.

This program sheds light on the evolution and spread of Christianity across 13 centuries of architecture and art. Selected sites and masterpieces include the 8th-century monastic settlement on Inishmurray Island, off the coast of Ireland; frescoes in the catacombs of San Domitilla and Caravaggios at Santa Luigi di Franchesi, in Rome; the Hagia Sophia, once a Christian cathedral, in Istanbul; the astonishing underground churches of Lalibela, in Ethiopia;...

Did the Soviet Union collapse under external pressure or its own weight? What enabled free market forces to assert themselves in China? Is socialism dead, or has it simply evolved? This program addresses these and other questions, focusing on the political, cultural, and economic factors behind the fall of the iron curtain regimes. Outlining the Cultural Revolution and its consequences, the emergence of the Reagan and Thatcher administrations, and...

Explores what volcanoes are and how they can be both harmful and helpful to human beings.

Water covers most of our Earth’s surface area. In this program, we’ll discuss the characteristics of the sea and its impact on climates and coast lines. Topics include: Marine Plants, Sea Water Characteristics, Ocean Currents, Sea Water Temperature, Wave and Tide Formation, Tsunamis, The Sea Bed, and Underwater Gas and Petroleum Deposits.

This book introduces diamonds, the hardest natural substances on Earth, describing how they are formed, where they are found, and how they are used.