SOLAR SYSTEM

Detailed explanation-1: -The inner core is solid, the outer core is liquid, and the mantle is solid/plastic. This is due to the relative melting points of the different layers (nickel–iron core, silicate crust and mantle) and the increase in temperature and pressure as depth increases.

Detailed explanation-2: -Heavy elements, like iron and nickel, began sinking toward the center of the planet. As this happened, Earth separated into layers. Lighter material formed the outer layer. Denser, heavier material sank to the center of Earth.

Detailed explanation-3: -The separation of Earth into layers based on density is known as differentiation. The densest material moved to the center to create the planet’s dense metallic core. Materials that are intermediate in density became part of the mantle (Figure below). Earth’s interior: Inner core, outer core, mantle, and crust.

Detailed explanation-4: -Planet Earth is organized into layers of varying thickness. This solid, rocky planet becomes denser as one travels into its interior. Gravity has caused the planet to differentiate, meaning that denser material have been pulled towards Earth’s center. Relatively less dense material migrates to the surface.