The study pushes back the clock on the origin of Earth's water by hundreds of millions of years, to around 4.6 billion years ago, when all the worlds of the inner solar system were still forming. Scientists had suspected that our planet formed dry, with high-energy impacts creating a molten surface on the infant Earth.
Answer: 4.6 billion years.
1. B
2. D
3. A
4. D
5. B
6. B
7. A
8. A
9. D
10. A
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The big ban occurred at the beginning of the year the first second[437 . 5 years per second] of January , the solar system and life at September.
