Development of Lithosphere in Earth Evolution
The earth has a layered formation. From the outmost end of the atmosphere to the centre of the earth, the substance that exists is not consistent. The atmospheric matter has the least density. From the surface to deeper depths, the earth’s interior has dissimilar zones and each of these contains materials with diverse characteristics.
The earth was typically in a volatile state throughout its elemental stage. Due to gradual enlarge in density the temperature inside has increased. As a consequence the substance inside started getting divided depending on their densities. This allowed heavier materials (like iron) to sink towards the centre of the earth and the lighter ones to move towards the surface. With passage of time it cooled further and solidified and condensed into a smaller size. This later led to the growth of the outer surface in the form of a crust. During the structure of the moon, due to the huge impact, the earth was further heated up. It is through the procedure of separation that the earth forming material got separated into diverse layers. Starting from the surface to the central parts, we have layers like the crust, mantle, outer core and inner core. From the crust to the core, the density of the material increases.