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Which layer is located closest to the Earth's centre?

Answer and explanation

Correct answer: Inner core

Earth is arranged in several broad layers, and the layer nearest its exact centre is the inner core. It lies inside the outer core and forms the deepest part of the planet. The inner core is mainly composed of iron and nickel and remains solid because the pressure at this depth is extremely high, even though the temperature is also very great. Thus, the correct choice is C, Inner core.

To identify the answer, compare each option with its position from the surface inward. The crust is the thin outer layer, while the lithosphere includes the crust and the rigid uppermost mantle. The mantle lies below the crust and surrounds the core, so neither is closest to the centre. The core has an outer and an inner part; the inner core is the innermost layer of all. Therefore, option C follows directly. This question asks about location, not which layer is thickest or hottest.

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Inner CoreEarth CentreCore

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