What is another word for hadean?
Pronunciation: [he͡ɪdˈi͡ən] (IPA) 
Hadean, a term used to describe the earliest eon in Earth's history, can be replaced with several synonyms. For instance, it can be substituted with Pre-Cambrian, an era that began 4.5 billion years ago before life emerged, and spans to about 541 million years. Archean is also a suitable synonym for Hadean, as it represents the era when the first life forms emerged on Earth. Similarly, it can be replaced with the term Precambrian rocks, which refers to the rocks formed during this earliest period of Earth's history. These synonyms can be used interchangeably to describe the early stages of life on Earth, by geologists, scientists, and historians alike.
