Which one of the following is the thinnest layer of the Earth ?

Inner Core

Outer Core

Mantle

Crust

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UPSC Geoscientist – 2024

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The Earth’s layers, from outside to inside, are the Crust, Mantle, Outer Core, and Inner Core. The Crust is the outermost and thinnest layer.

The relative thicknesses of Earth’s main layers are: Crust (5-70 km), Mantle (~2900 km), Outer Core (~2300 km), and Inner Core (~1220 km).

The thickness of the crust varies significantly; it is thinner under oceans (oceanic crust) and thicker under continents (continental crust). Despite this variation, it remains the thinnest layer compared to the mantle and core.

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