Earth's solid iron core formed a BILLION years ago and is still growing
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How the Earth and moon formed, explained
Earth's solid inner core formed about 1.3 billion years ago
The center of the Earth is an iron ball with a radius of 650 kilometers, Science
The amazing world that scientists are uncovering beneath the Earth's crust
Researchers peer into Earth's inner core: Data show solid metal sphere is 'textured
Formation of the Earth, Overview & Theory - Lesson
A 650-km thick solid metallic ball forms the earth's innermost inner core - Frontline
Where is the core of the Earth? - Quora
EarthSky Earth's lopsided core? Strangeness in our planet's interior
Scientists unlock secrets of Earth's wickedly hot innermost realm
Earth's inner core is slowing down its spin. Should we be worried? - BBC Science Focus Magazine
A New Power Source for Earth's Dynamo
Iron atoms discovered on the move in Earth's solid inner core
Earth's inner core is much younger than we thought
