Differentiation is a process by which which description best fits the distribution of materials in the early Earth?

• A. It involves lighter elements accumulating at the surface.
• B. It causes heavy elements to settle at the core while lighter ones rise toward the surface.
• C. It has no influence on the Earth's structure.
• D. Denser materials like iron sank to the center while less dense materials like rock rose to the surface.

Answer: (D)

Differentiation is gravity-driven separation by density that happens when the early Earth was molten. Heavier materials, especially iron and nickel, sink toward the center to form the core, while lighter silicate materials rise toward the surface to form the mantle and crust. This creates the layered planet we have today. The description that best fits this distribution states that denser materials like iron sank to the center and less dense materials like rock rose to the surface, capturing both the core and the surface layering. A describes light elements at the surface, which isn’t the overall distribution; C says differentiation has no influence, which is incorrect; B is close but less explicit about the resulting layered structure.