Hayat Ashraf

The evolution of the Earth refers to the changes that have occurred on our planet over billions of years, including geological, biological, and environmental transformations. The Earth's evolution can be divided into several key stages: 1. Formation: As discussed earlier, the Earth formed approximately 4.6 billion years ago from a rotating disk of gas and dust known as the solar nebula. Through the process of accretion, the Earth grew in size and began to differentiate into distinct layers. 2. Hadean Eon: This eon, which lasted from the formation of the Earth to about 4 billion years ago, is characterized by intense heat and volcanic activity. During this time, the Earth's surface cooled, the solid crust formed, and the atmosphere began to develop. 3. Archean Eon: The Archean Eon, which spanned from about 4 billion to 2.5 billion years ago, saw the emergence of the earliest forms of life. Simple, single-celled organisms such as bacteria and archaea appeared in the oceans. The E...