Crust: Outermost layer, rigid and thin., Beneath oceans: ~5 km thick., Beneath continents: averages ~30 km thick., Under large mountain ranges: up to 100 km thick., Brittle and can break., Mantle: Located below the crust., Dense, hot layer of semi-solid rock., Approximately 2,900 km thick., Contains more iron, magnesium, and calcium than the crust., Hotter and denser due to increasing temperature and pressure with depth., Core: Centre of the Earth., Nearly twice as dense as the mantle., Composed of a metallic iron-nickel alloy., Two parts:, Liquid outer core: ~2,200 km thick., Solid inner core: ~1,250 km thick., The liquid outer core's rotation creates the Earth's magnetic field.,

Structure of the Earth

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