In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: Which observation demonstrates that light waves travel much faster than sound waves? Answer: An exploding firework is seen before it is heard.
[A]: An exploding firework is seen before it is heard observation demonstrates that light waves travel much faster than sound waves.


[Q]: Question: Which of the following sets contains only objects that shine as a result of reflected light? Answer: moons, planets, and comets
[A]: The setmoons, planets, and comets contains only objects that shine as a result of reflected light.


[Q]: Question: What element has the atomic number 16? Answer: sulfur
[A]:
The element sulfur has the atomic number 16.