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Which of the following best describes the conditions on earth over 4 bilion years ago?
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Which of the following best describes the conditions on earth over 4 bilion years ago?

User Hasser
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Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old
User Arief Wijaya
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Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old.

User Anton Chikin
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