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Cast
Seasons

1.Born of Fire
13-02-200750mWhy is the Earth so restless? What causes the ground to shake violently, volcanoes to explode, and great mountain ranges to rise to incredible heights? National Geographic takes vi...

2.Ocean Realm
16-02-200750mBeautiful, bewildering, and bizarre - our oceans dominate our planet. How did they form? Why haven't they evaporated? Starting with the primordial weather burped out of the molten...

3.Destructive Forces
21-02-200750mWhy do mountains have a triangular shape? How much rain must fall to start a river? How does one grain of sand become an entire dune? Join National Geographic as we show you how th...
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