response: Got it, what about the red sky? I know that it results from Rayleigh scattering.
original_response: I understand. I like red sky at sunset. It comes from rayleigh scattering.
history: Have you ever thought about red foods? Do you know what makes them red? Actually, I don't know that. I know what makes the planet Mars red though, it's iron oxide. For food is much worse than that actually. The dye Red 40 is actually made from crushed red beetles. My daughter, who is vegetarian, found that out. I did not know that. Is vegetarianism when you don't eat any meat like chicken or steak? Yes, and I learn a lot with her, I have limited red foods and gelatin now.
knowledge: The red sky at sunset results from Rayleigh scattering, while the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide.