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For hundreds of years, people found the fossils of ancient sea creatures at the tops of tall mountains. Scientists puzzled over this problem. A fish couldn't have swum up a mountain. And how could rocks on a mountain move up from the bottom of a sea? Geologists finally found the answers they needed in the 1960s, when they developed the theory of plate tectonics. This theory revolutionized our understanding of the earth. Plate tectonics explains how...
9) Volcanoes
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"A nonfiction primer on all thing volcanoes, including the different types of volcanoes, the work of volcanologists, and more"--
Description
From the Great Lakes to Iceland, the San Andreas Fault to Krakatoa, travel the globe to reveal the physical processes that have shaped some of the most well-known locations and geological phenomena in the world. With rocks as their clues and volcanoes, ice sheets, and colliding continents as their suspects, scientists launch a forensic investigation that helps visualize how the earth has evolved and formed over billions of years.
Description
This season, How the Earth was Made goes back in history-- from 4.5 billion years ago to today-- peeling back layers of rock, filling up river canyons, parting the oceans, and leveling mountains and volcanoes to investigate the origins of some of the most well-known locations and geological phenomena in the world. With rocks as their clues and volcanoes, ice sheets and colliding continents as their suspects, scientists launch a forensic investigation...
Description
Disc 1: How the earth was made. Examines the origin and geological evolution of the earth, focusing on the various cataclysmic transformations that occurred through time.
Disc 2 : A global warning? The History Channel answers the question: After 650 million years of climate change, is global warming simply a naturally occurring phenomenon, or the result of human activity?
Disc 3 : Life after people. What will the world be like when mankind is extinct?...
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