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Earth’s mysterious innermost core is a 400-mile-wide metallic ball

Except for the thin crust we live on, Earth’s structure is intangible deep beneath our feet, and as a result hard to imagine. 

Foods are often used to demonstrate how Earth is made of four main layers, metaphors that call to mind a tasty snack (opens in new tab): graham crackers for the crust, ice cream for the mantle, melted marshmallows for the outer core and chocolate chips for the inner core.

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