archean

• صفة تعني المتعلق بأقدم دهر جيولوجي (الدهر السحيق/الأركي) أو بذلك الزمن القديم جداً؛ وتُستخدم اليوم أساساً كمصطلح علمي في الجيولوجيا.

An obsolete adjective referring to the earliest geological eon (the Archean Eon), or something belonging to that ancient time; now primarily used as a proper noun in geology.

1. Geological eonC2formalscientific

   Relating to the Archean Eon, the second major division of Precambrian time, spanning from about 4 billion to 2.5 billion years ago, characterized by the formation of the Earth's earliest known rocks and the emergence of primitive life.

   الأركي

   • The Archean rocks in this region contain some of the oldest minerals on Earth.
   • Geologists study Archean formations to understand the early development of the planet's crust.
   • Fossil evidence from the Archean eon is extremely rare and difficult to find.

   المرادفاتarchaeanarchaeozoicarcheozoic

• اسم يُطلق على الدهر الجهنمي (الأركي)، وهو أقدم دهور الحياة القديمة، يمتد من نحو 4.0 إلى 2.5 مليار سنة مضت، ويشمل الفترة التي تشكّلت فيها القشرة الأرضية وظهرت فيها أشكال الحياة الأولى.

A proper noun referring to a specific geological eon, the Archean Eon, which spans from about 4.0 to 2.5 billion years ago, representing the time when the Earth's crust formed and early life appeared.

غير معدود · اسم علم

1. Geological eonC2formalscientific

   The earlier of the two divisions of the Precambrian supereon, spanning from about 4 billion to 2.5 billion years ago, characterized by the formation of the Earth's crust and the appearance of the first life forms.

   الدهر السحيق

   • The Archean eon saw the formation of the first stable continents.
   • Fossils from the Archean are extremely rare due to metamorphism.
   • The atmosphere during the Archean was largely devoid of free oxygen.

   المرادفاتarchaeanarchaeozoicarcheozoic