The article delves into the significant geological and biological events that occurred around 3.7 billion years ago on Earth, highlighting its importance in the planet’s evolutionary history. The main keyword, “What happened 3.7 billion years ago on Earth,” addresses the search intent of users looking for information about early Earth conditions, the emergence of life, and the environmental changes that shaped the planet.

The content offers a detailed exploration of the Hadean and Archean eons, discussing the formation of the Earth’s crust, the development of the atmosphere, and the earliest signs of life, such as microbial organisms. It aims to educate readers about the foundational events that contributed to the evolution of life, making it a valuable resource for webmasters seeking to provide informative and engaging content on Earth’s history.