Core: This layer is nearly twice as dense as the one above it., It is composed of a 2,200 km-thick liquid part and a 1,250 km-thick solid part., The magnetic field is created by the rotation of its liquid part., This layer is at the center of the Earth., It is composed of a metallic (iron-nickel alloy) material., This layer's liquid part spins as the Earth rotates., Mantle: It is a dense, hot layer of semi-solid rock., This layer is located below the outermost layer., It contains more iron, magnesium, and calcium than the outermost layer., This layer is approximately 2,900 km thick., It is hotter and denser because temperature and pressure increase with depth., It is denser than the outermost layer., This layer is hotter than the outermost layer., It is located below the outermost layer., Crust: This layer is the outermost and is rigid and very thin compared to the others., It is brittle and can break., Beneath oceans, this layer is generally about 5 km thick., Beneath continents, this layer averages about 30 km thick., This layer can be up to 100 km thick under large mountain ranges., This layer is the outermost part of the Earth.,

Structure of the Earth

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