behind every geologist is a strong desire to eat rock

Chocklet

Kerbal space program was right!

One of the pictures shows the mantle having a slight green hue.

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."

Related fun fact: The Earth's crust is largely made of feldspars: https://en.wikipedia.org/wiki/Feldspar

You mean it’s not a gobstopper?

Bastards! What am I doing licking things, then?

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...