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How the Earth Works

Ice Age or Hell Fire?

Season 1 Episode 7
Geologist Martin Pepper and biologist Liz Bonnin explore North America to find evidence of the most powerful geological events the Earth has ever seen: Ice Ages. Finding out how they have both carved the land but also moulded the life that lives up
  • 44 min
  • TV-PG
  • Premiered 11/20/2013