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On chemical basis what is the correct order of three major Earth layers from surface to centre?

Answer and explanation

Correct answer: Crust mantle core

The direct answer is A: crust, mantle, core. Scientists divide Earth chemically according to composition. Starting at the surface, the thin rocky crust comes first. Beneath it lies the much thicker mantle, made of dense silicate rocks. At the centre is the metallic core, mainly associated with iron and nickel. Therefore the sequence from outside to inside is crust → mantle → core. B reverses the sequence and begins at the centre. C places the mantle before the crust and is therefore incorrect. D wrongly places the core between the crust and mantle. Do not confuse this chemical division with mechanical divisions such as lithosphere and asthenosphere; those describe physical behaviour, not the three main compositional layers. Memory cue: surface to centre means C-M-C: crust, mantle, core.

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Chemical-LayersCrustMantleCore

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