New theory on how Earth’s crust was created

Research

Conventional theory holds that all of the early Earth’s crustal ingredients were formed by volcanic activity. Now, however, McGill earth scientists Don Baker and Kassandra Sofonio have published a theory with a novel twist: some of the chemical components of this material settled onto Earth’s early surface from the steamy atmosphere that prevailed at the time. The experimental findings could guide search for exoplanets that may harbor life.