AI Explain

• Hadean Eon


  The first eon in the geologic time scale, spanning from the formation of the Earth 4.6 billion years ago to the beginning of the Archean Eon 4 billion years ago. It is named for the Greek god of the underworld, Hades, because it is believed to have been a time of intense heat and volcanic activity.
• Proterozoic Eon


  The third eon in the geologic time scale, spanning from 2.5 billion to 541 million years ago. During this time, the first multicellular organisms appeared, and the Earth's atmosphere began to accumulate oxygen.
• Phanerozoic Eon


  The current eon in the geologic time scale, beginning 541 million years ago and continuing to the present day. It is marked by the evolution of complex life forms, including plants, animals, and fungi, and is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic.