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Air Date: 2007-02-13
Why is the Earth so restless? What causes the ground to shake violently, volcanoes to explode, and great mountain ran...
Air Date: 2007-02-16
Beautiful, bewildering, and bizarre - our oceans dominate our planet. How did they form? Why haven't they evaporated?...
Air Date: 2007-02-21
Why do mountains have a triangular shape? How much rain must fall to start a river? How does one grain of sand become...