On early earth, what was referred to as the "primordial soup"?

Primordial soup is a theory created by the biologist Alexander Oparin, it established that life originated in a pond or an ocean as a result of chemicals combinations produced by the earths atmosphere and some forms of energy to make amino acids, the building blocks of proteins, which would then evolve into all species

Yes he thought they should be left to chance why, because he thought that was the best thing to do