Earth
Early Earth was covered in a global ocean and had no mountains
Some 4.4 billion years ago, soon after its formation, Earth was a much quieter and duller place than it is today, according to analysis of minerals from that time
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Some 4.4 billion years ago, soon after its formation, Earth was a much quieter and duller place than it is today, according to analysis of minerals from that time
Computer simulation confirms that water can form within our planet rather than arriving from space, and the process may explain mysterious deep quakes