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The inner core of the Earth is 700 million years old? - ResOU
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A Brief History of Earth: How it All Began - The Wire
The oldest person in the world now is an American
What Did Early Earth Look Like? - Business Insider
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These Pictures Show Just How Big The First Earth Day Really Was 50
Pictures of Earth by Planetary Spacecraft | The Planetary Society
What Earth Day means to me | HaltonRecycles