Earth's solid iron core formed a BILLION years ago and is still growing

New study indicates Earth's inner core was formed 1 - 1.5 billion years ago

Curious Kids: what would happen if the Earth's core went cold?

History of the Earth timeline

What percentage of the Earth's mass is contained in its iron core? - Quora

How do we know that the outer core of the Earth is liquid? - Quora

Earth's solid iron core formed a BILLION years ago and is still growing

Iron atoms discovered on the move in Earth's solid inner core

Genes from Mota Cave skeleton supports the theory of a Eurasian migration into Africa

The center of the Earth is an iron ball with a radius of 650 kilometers, Science