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The mantle is not exactly solid. It turns out that real life is a lot more complicated than the solid/liquid/gas trichotomy taught in elementary and secondary schools. For example, there are non-Newtonian fluids, and then there's the distinction between amorphous and crystalline solids, and supercritical fluids, and and and.

The mantle is pretty rigid on human timescales (so "solid" isn't exactly wrong), but on geologic timescales it's better thought of as an extremely viscous fluid (so "liquid" isn't exactly wrong either).

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