Geology - The study of rocks., Inner Core - The Earth's innermost layer, made from iron and nickel., Outer Core - Below the mantle, made from very hot liquid., Mantle - Between the crust and the core, made from a semi-liquid., Crust - The outermost layer of the Earth., Volcano - A cone shaped mountain or hill containing lava that can erupt onto the Earth's surface.,

Rocks

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