How looked EARTH like 4 billion years ago?

4 billion years ago, during Katarchean, the Earth was not the most hospitable place. Atmosphere, in fact, was not there, and the hydrogen and helium constantly dwindled. On the surface of young planets periodically falling planetesimals, fragments Protoluny and the nuclei of comets. 


Geological evidence of the era gone due later melting of the upper mantle and dive into her ancient lithosphere, so you have to use the imagination to understand how the planet looked like 4 billion years ago. Artist's conception of the Earth at that time was pocked with craters from numerous collisions with cosmic bodies. After about a billion years, a first supercontinent.