What is the correct order of Earth's internal layers from outermost to innermost?

Correct answer: Crust mantle core

The direct answer is C: the order from outermost to innermost is crust, mantle, core. Start at Earth’s surface. The crust is the thin, solid outer layer on which we live. Beneath it lies the mantle, a much thicker layer of hot rock that can move very slowly. At the centre is the core, mainly made of iron and nickel; its outer part is liquid and its inner part is solid because of enormous pressure. Option C is correct because it follows the required outside-to-inside direction: crust first, mantle second, core last. Option A is the reverse inward arrangement and begins with the core, so it is wrong. Option B places the mantle before the crust, so it does not begin with the outermost layer. Option D puts the core between the crust and mantle, which is structurally incorrect. Memory trick: “C-M-C” means crust, mantle, core when moving inward.