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Where Did Earth’s Water Come From? - Zachary Metz

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Channel: TED-Ed
Categories: Biology   |   Chemistry   |   Environmental   |   Science  
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View full lesson: http://ed.ted.com/lessons/where-did-earth-s-water-come-from-zachary-metz Water covers over 70% of the Earth, cycling from the oceans and rivers to the clouds and back again....

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