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Origin of the world's oceans : ウィキペディア英語版 | Origin of water on Earth
The origin of water on Earth, or the reason that there is clearly more liquid water on the Earth than on the other rocky planets of the Solar System, is not completely understood. There exist numerous more or less mutually compatible hypotheses as to how water may have accumulated on the Earth's surface over the past 4.6 billion years in sufficient quantity to form oceans. ==Possible reasons==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Origin of water on Earth」の詳細全文を読む
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