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How do we know there was an ocean on the Earth 4.28 billion years ago?

How do we know there was an ocean on the Earth 4.28 billion years ago?
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How do we know there was an ocean on the Earth 4.28 billion years ago?

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User Chhantyal
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Answer:

Research funded partly by NASA has confirmed the existence of liquid water on the Earth's surface more than 4 billion years ago.

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User Kaya Ryuuna
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