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https://www.livescience.com/waterworld-earth.html

1.5 billion-year-old Earth had water everywhere, but not one continent, study suggests | Live Science
www.livescience.com

1.5 billion-year-old Earth had water everywhere, but not one continent, study suggests | Live Science

Chemicals in ancient ocean rocks hint that 3.2 billion years ago, the surface of a baby Earth was continent-free and covered by a global ocean.