Most of the 420 minerals of the Hadean Eon
formed from magma-molten rock that slowly crystallized at or near Earth's surface-as well as the alteration of those minerals when exposed to hot water," he said.
But as the Earth cooled through this period, called the Hadean eon
, it slowly became a more habitable place.
Impact evidence from lunar samples, meteorites and the pockmarked surfaces of the inner planets paints a picture of a violent environment in the solar system during the Hadean Eon
That's slightly higher than Earth's average heat loss today but only one-third to one-fifth the rate expected for the Hadean eon
Geologists call that time the Hadean Eon
, and thought its fiery hell of impacts would have sterilised the Earth.