Earth’s History Is Hidden in These Strange Maps

Transcript

(gentle music) - [Joe] Deep ancient channels, so massive in scale, they can be seen from space. Ripple marks, like something you'd typically see on a beach, but they're the size of sand dunes. This is no ordinary river channel. It's the scar from one of the most violent, Earth-changing events to happen in the last 20,000 years. (static crackles)

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