Brazil Eco Adventure Tours
Rainforest - Hiking & Biking - Wildlife

During Hadean times, the chemical and physical basic structure of Earth was formed. The heavier elements, such as iron and nickel, sank into the Earth's core (6.371 - 2.900 km) and the lighter elements, such as Oxygene, Silicon and Aluminium rose into the Earth's viscous mantle (2.900 km - 40 km).

At the end of this eon, the Earth's outer silicate solid crust (40 - 0 km) was formed. The implication is that at this time the entire Earth was covered by a primeval ocean.