question: What sentence would provide a factual answer to this question: "Quartz may produce rainbows when light is shined"

answer: a quartz is made of six-sided transparent crystals

question: What sentence would provide a factual answer to this question: "The crust under everyone's feet is"

answer: the crust is a layer of the Earth

question: What sentence would provide a factual answer to this question: "If an instrument is played, this may occur"

answer:
An example of playing a musical instrument is hitting the keys of a piano