Earth's solid iron core formed a BILLION years ago and is still growing
By A Mystery Man Writer
Description
How has Earth's core stayed as hot as the sun's surface for billions of years?
Journeys to the Center of the Earth
History of the Earth timeline
Scientists unlock secrets of Earth's wickedly hot innermost realm
temperature - Why has Earth's core not become solid? - Physics Stack Exchange
Earth's inner core is 'superionic', a state of matter somewhere between solid and liquid, study suggests - ABC News
Earth's inner core - Wikipedia
Secular Scientists: Earth's Inner Core Shouldn't Exist!
Earth's mysterious innermost core is a 400-mile-wide metallic ball
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