Well, it does come from dinosaurs in a sense, in so far as the word stands for the ancient - which TFA acknowledges. I think saying that oil comes from dinosau

Well, it does come from dinosaurs in a sense, in so far as the word stands for the ancient - which TFA acknowledges. I think saying that oil comes from dinosaurs gets the relevant point across despite being technically incorrect. I'm not sure if there's a better way to communicate the same knowledge in such a succinct way to a child.