Which major layers formed due to Earth's differentiation?

Correct answer: Crust, mantle and core

Earth’s differentiation produced three broad compositional layers: the crust, the mantle and the core. In the hot early Earth, gravity caused dense metallic materials, mainly iron and nickel, to sink toward the centre and form the core. Less-dense rocky material formed the mantle and the thin outer crust. Consequently, option A is the only answer that names internal geological layers created through differentiation. Clouds, rain and wind are atmospheric phenomena; rivers, lakes and ponds are surface-water features; and grass, shrubs and trees are living organisms. None of these groups represents Earth’s internal structure.