Useful english dictionary. 2012.
Hadean — I noun the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life • Syn: ↑Hadean time … Useful english dictionary
Hadean aeon — noun the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life • Syn: ↑Hadean,… … Useful english dictionary
Hadean time — noun the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life • Syn: ↑Hadean,… … Useful english dictionary
Eón Hadeico — Supereón Eón[1] M. años Fanerozoico 542,0 ±1,0 Precámbrico Proterozoico 2.500 … Wikipedia Español
Hadean — 1. adjective Of, or relating to the geologic eon from about 4,600 to 3,800 million years ago; marked by the formation of the solar system, a stable Earth Moon orbit and the first rocks. 2. noun The Hadean eon … Wiktionary
Hadean — The Hadean (pronEng|ˈheɪdiən) is the geologic eon before the Archean. It started at Earth s formation about 4.6 billion years ago (4600 Ma), and ended roughly 3.8 billion years ago, though the latter date varies according to different sources.… … Wikipedia
hadean — an eon of geologic time lasting from 4600m to 3800m years ago … Geography glossary
Priscoan eon — noun the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life • Syn: ↑Hadean,… … Useful english dictionary
Archean Eon — or Archaean Eon or Archeozoic Eon Older of the two divisions of Precambrian time. The Archean begins with the formation of the Earth s crust с 3.8 billion years ago and extends to с 2.5 billion years ago, up to the start of the Proterozoic Eon,… … Universalium
Precambrian eon — noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago • Syn: ↑Precambrian, ↑Precambrian aeon, ↑Precambrian period • Instance Hypernyms: ↑eon, ↑aeon • Part Meron … Useful english dictionary
