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- The great oceans formed over centuries as rain fell on the early Earth and drained into hollows, forming the primeval ocean. By 3.9 billion years ago, the Earth had cooled enough for water to condense and heavy rains to pour down, filling the great oceans. - The ozone layer thickened around 600 million years ago, shielding organisms from UV radiation and allowing for a massive diversification of life known as the Cambrian explosion. - The geologic time scale divides all of Earth

Author

Paul Lawrence Marasigan

Language

EN