The Earth formed as a rock, so where did the water come from? (video)

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As the folks at MinuteEarth point out, the Earth formed as a rock. It is actually classified as a "rocky planet" and is unlikely to have had any water at all in the beginning. Now 70% of the "big blue marble" is covered in water. So where did it come from? Well, just as we are (literally) made of stardust and the RNA that started life on Earth may have come from Mars, the answer to where the water came from is pretty awesome and definitely extra-terrestrial

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