2007-05-21 11:43:13 · 3 answers · asked by Riley Aostan 2 in Science & Mathematics ➔ Earth Sciences & Geology
An eon is a large period if geological time comprising of a number of eras. An era is the first order of a geological time unit.
The Hadean eon is an era of the Precambrian, about 4560-3800 million years ago
2007-05-21 11:53:33 · answer #1 · answered by Professor Kitty 6 · 0⤊ 0⤋
The Hadean is the oldest Eon of the precambrian, and lasted from the formation of the earth until about 4000 million years ago, and is the interval of earth's history for which essentially nothing (apart from the occasional highly resistant mineral grain) survives. It is followed by the Archaean eon, for which abundant (although usually very mangled!) rocks survive.
I think the word comes from greek mythology, Hades, the underworld.
2007-05-25 15:43:45 · answer #2 · answered by Andrew 5 · 0⤊ 0⤋
it means this was the time when earth looked like it was in the underworld
2007-05-21 20:26:19 · answer #3 · answered by ambroisiaaaa 2 · 0⤊ 1⤋