GEOLOGY

Detailed explanation-1: -The solid metal inner core is the densest layer, the mantle is intermediately dense, and the lithosphere, particularly the continental lithosphere, is the least dense layer. The crust is the thinnest and least dense layer in comparison to the other layers.

Detailed explanation-2: -The inner core is at the center of the Earth because it is the densest, made of solid iron and nickel.

Detailed explanation-3: -The density of the inner ‘solid’ core is between 9.9-12.2 g/cm3 and the outer core’s density is between 12.6-13 g/cm3.

Detailed explanation-4: -At the center of the Earth lies the core, which is nearly twice as dense as the mantle because its composition is metallic (iron-nickel alloy) rather than stony.

Detailed explanation-5: -The inner core is the core of the earth which is in a solid-state. The density of this sphere is around 13.3 gm/cubic cm. Iron and nickel are the major elements found here.