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Frozen regions of the world, including the poles and the tops of mountain ranges, are explored. Featured: organisms that can survive in the coldest conditions on Earth. Narrated by Sigourney Weaver.
Examining shallow seas that lie above continental shelves, where sunlight can reach the seabed. Included: the rich and varied aquatic life of coral reefs. Narrated by Sigourney Weaver.
Forests are examined, from California to Siberia to Madagascar. Included: different species of trees. Sigourney Weaver narrates.
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