Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: In a heat map, what color represents the hottest temperatures? Answer: bright yellow
A heat wave over the United States as indicated by heat radiated from the ground. The bright yellow areas are the hottest, and the blue and white are coolest.

Question: What forces keep the moon orbiting the earth? Answer: gravitational
This photograph was taken by Apollo 8 crewmember Bill Anders on December 24, 1968, showing the Earth rising above the lunar surface. Gravitational forces keep the moon orbiting the Earth.

Question: What is produced when sulfur and oxygen combine? Answer: sulfur oxide
Sulfur oxides are produced when sulfur and oxygen combine. This happens when coal that contains sulfur burns.