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Here I thought the joke was going to be “The Earth is actually a complete sphere without having any slices or cross-sections taken out of it like that.”
One of the pictures shows the mantle having a slight green hue.
The mantle is between 500-4500K, meaning most of it is hot enough to glow at least a dull red.
You don’t say lava is black because once it cools down it turns black…