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

Apart from the thin crust on which we live, the structure of the Earth is intangible deep beneath our feet, and as a result difficult to imagine.

Food is often used to demonstrate how the earth is made of four main layers, metaphors reminiscent of a tasty snack (opens in a 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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