Snowball Earth

22nd April 2005 1 hour Season 1 Episode 2

Over the ages, continents have shifted their positions, wind and rain shaping and reshaping the surface. Scientists believe that at least two total ice ages have occurred, each lasting for millions of years.

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Season 1 · Episode 3

New Frontiers

From microbes to the first complex creatures, life was always searching for new frontiers. By 450 million years ago, Earth had become a less violent planet - no longer bombarded by giant meteors from space and the great ice ages had passed.

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