الإنجليزية - الإنجليزية
تعريف archean eon في الإنجليزية الإنجليزية القاموس.
- 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 3.8 billion years ago and extends to 2.5 billion years ago, up to the start of the Proterozoic Eon, the second division of the Precambrian Period. The earliest and most primitive forms of life (bacteria and cyanobacteria) originated 3.5 billion years ago in the middle of the Archean Eon (the Archean's alternative name, Archeozoic, means "ancient life")
archean eon
الواصلة
Ar·che·an e·onالنطق
Resimler
السابق
المفضلات