SOLAR SYSTEM

Detailed explanation-1: -The differentiation, or organization, of the Earth into layers is perhaps the most significant event in its history. It led to the formation of a core, a crust, and eventually continents. The light elements were driven from the interior to form an ocean and atmosphere. These four blocks are the same size.

Detailed explanation-2: -Isotopic analyses suggests that the average age of the present continental crust is about 2.5 billion years. Thus, in all probability, repeated partial melting of the upper mantle formed successively more refined, continent-like crustal rocks starting before 4 billion years ago.

Detailed explanation-3: -As large planetesimals grow, heat released by repeated impacts and the radioactive decay of elements inside their minerals–enough to cause melting. This allows materials with different densities to separate, with metals like iron and nickel sinking to the inside to form a core and lighter rocks “floating” on top.