ARCHEAN EON Introduction / Definition The Archean Eon is a major division of geological time, spanning from about 4.0 to 2.5 billion years ago. It is the second eon of Earth’s history, following the Hadean Eon and preceding the Proterozoic Eon. The name “Archean” comes from the Greek word archē, meaning “beginning” or “origin,” reflecting the early development of Earth’s crust, continents, and the earliest known life. CHARACTERISTICS OF THE ARCHEAN EON 1. Formation of the Earth’s Crust The Earth

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