Correct Answer: D

Rationale: The inner core is the hottest layer of the Earth, with temperatures reaching up to 5,700°C—comparable to the surface of the sun. It consists primarily of solid iron and nickel, compressed by immense gravitational pressure. Despite its high temperature, it remains solid due to the extreme pressure at Earth’s center. The inner core plays a vital role in generating Earth’s magnetic field through interactions with the liquid outer core. Understanding this layer provides insights into the planet’s formation, heat flow, and geodynamic processes that drive phenomena like volcanism and plate tectonics.

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