The sialic continents, mafic ocean floors, the crust, the mantle and the core were all formed while the early melted earth cooled and differentiated as low density minerals floated to the surface and heavy, denser minerals sank to the center.
a)fact
b)theory

This is a theory.

Step-by-step explanation:

The sialic continents, mafic ocean floors, the crust, the mantle and the core were all formed while the early melted Earth cooled and differentiated as low density minerals floated to the surface and heavy, denser minerals sank to the center.

This is a theory.