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How did Earth's layers develop?

Answer 1

By a process called differentiation.

Differentiation is thought to occur in all planets, whereby denser elements sink to the core of the planet and lighter elements move upward. Once this process is completed, the planet takes on a layered look. See the Wiki entry.

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Answer 2

Jonathan Avila

Earth's layers developed through a process called planetary differentiation, which occurred early in Earth's history. During this process, Earth's interior heated up due to the energy released by gravitational collapse and radioactive decay. This led to the melting of materials, causing denser materials to sink towards the center, while lighter materials rose towards the surface. Over time, this process resulted in the formation of distinct layers: the inner core, outer core, mantle, and crust, based on differences in density and composition.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.