4.6 million years?
almost 4.6 billion years?
46 billion years?
or half as long as Earth has existed?
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Answers (2)
Depends on what kind of "ocean" your talking about. The Hadean oceans were mostly fresh water (salt is caused by erosion of land...this takes time). The Hadean Eon was about 4.6 billion years ago.
Reference: Geology class
Since the beginning of Earth, about 4.6 billion years (4.55 to be exact).