- The
Hadean (/heɪˈdiːən, ˈheɪdiən/ hay-DEE-ən, HAY-dee-ən) is the
first and
oldest of the four
known geologic eons of Earth's history,
starting with the...
-
Hadean zircon is the oldest-surviving
crustal material from the Earth's
earliest geological time period, the
Hadean eon,
about 4
billion years ago. Zircon...
-
Precambrian is an
informal unit of
geologic time,
subdivided into
three eons (
Hadean, Archean, Proterozoic) of the
geologic time scale. It
spans from the formation...
-
Adrian Hădean (born 4
September 1977, Arad) is a
Romanian chef. He grew up in Baia Mare, a city in
northern Romania,
where he also made his
debut as a...
- the
second of the four
geologic eons of Earth's history,
preceded by the
Hadean Eon and
followed by the Proterozoic. The
Archean represents the time period...
-
erosion or melted, are more than 4
billion years old,
formed during the
Hadean Eon of Earth's
geological history, and mark the
start of the
Archean Eon...
- date:
Hadean zircons that
formed around 4.404
billion years ago.
These zircons have
enabled deeper research into the
conditions on
Earth in the
Hadean eon...
-
understanding of the
Hadean eon.
Older references generally show that
Hadean Earth had a
molten surface with
prominent volcanos. The name "
Hadean"
itself refers...
- of the
geologic record. It
spans 431
million years, from the end of the
Hadean Eon 4031 Mya to the
start of the
Paleoarchean Era 3600 Mya. Some estimates...
-
formation of a
solid crust, and
allowing liquid water on the surface. The
Hadean eon
represents the time
before a
reliable (fossil)
record of life; it began...
