Hadean Eon | Start, Timeline, & Facts | Britannica
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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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PROTEROZOIC EON Introduction The Proterozoic Eon is the geological eon that lasted from about 2.5 billion years ago (Ga) to 541 million years ago (Ma), coming after the Archean Eon and before the Phanerozoic Eon. It is one of the most significant intervals in Earth’s history, as it witnessed major geological, biological, and atmospheric changes that set the stage for complex life. FEATURES 1. Continental Development Stable cratons and large continental landmasses formed. Supercontinents such as
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