Clues in ancient rock suggest the early Earth did not have continents like we have today, but was covered by an ocean.
at the seafloor, down to a granitic intrusion which was the heat engine for the system."
The results suggest the oxygen isotope composition of the ocean all these billions of years ago exhibited higher ratios of oxygen-18 than it does today.In comparison, today's oceans are relatively light in"heavy" oxygen and contain a greater concentrations of so-called"light" oxygen . This is because clay in the Earth's soil appears to"prefer" oxygen-18, absorbing it in higher levels than oxygen-16.
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