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Week 2: Planets, large and small

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This is a diagram of the Earth, with a segment cut away, displaying the core. The core is labelled core of iron, and the next layer from the core, is labelled mantle. The outer layer is labelled atmosphere, and the layer between the atmosphere and the mantle is labelled crust. There is a dashed line running horizontally from the core to the edge of the Earth. This is labelled RE.