युग: पृथ्वी के सबसे व्यापक अध्याय भूवैज्ञानिक समय पैमाना ईओन्स से शुरू होता है जो समय का सबसे लंबा विभाजन है। The Eons: Earth's Broadest Chapters The geological time scale begins with the eons, the longest divisions of time. Hadean Eon (4.6 to 4 billion years ago): Named after Hades, the Greek god of the underworld, the Hadean Eon represents the chaotic beginnings of Earth. During this time, the planet was a molten, hostile world bombarded by asteroids and comets. The formation of the Moon, likely from a colossal collision between Earth and a Mars-sized body, also occurred during this eon. Eventually, the planet began to cool, and the first crust formed. Archean Eon (4 to 2.5 billion years ago): Life on Earth began in the Archean Eon. The first simple, single-celled organisms—prokaryotes—emerged in Earth's primordial oceans. Stromatolites, layered structures formed by cyanobacteria, are among the earliest evidence of life. The atmosphere was dominated by volcanic gases, with little t…