How the Earth Was Made - America's Ice Age

Seizoen: 2 - Aflevering: 12 / 26 - Eerst uitgezonden: 16 februari 2010 - Episode ID: 470465

A look at past Ice Age eras that Earth has experienced throughout its existence; how the slightest changes in the planet's orbit and angle of rotation can bring them about; how long they can last, and when the Earth will endure another.