Earth has evolved through geological and biological processes, with traces of salinity. 

The outer surface is divided by several tectonic plates that gradually migrate. The interior 

is efficient, with a flexible insulation made of thick layers and an iron-filled core that

 creates a magnetic field.

The solid interior and liquid exterior together form the Earth's iron core.

 Currents and the geomagnetic field are generated by convection in the core.

Significant changes in the initial conditions of the atmosphere have been caused 

by life forms. This creates environmental balance and surface stability.

Although there are wide regional differences in climate due to latitude and other topographic

 factors, the long-term average global climate has been fairly stable and variable in 

temperature during interglacial periods. Both differences have had important consequences 

for the history of ecological balance and the actual geology of the Earth .