question: What sentence would provide a factual answer to this question: "Erosion can"

answer: wind causes erosion

question: What sentence would provide a factual answer to this question: "What does a seismograph measure?"

answer: a seismograph is used for measuring the size of an earthquake

question: What sentence would provide a factual answer to this question: "What causes rock layers to fold on top of each other?"

answer:
earthquakes cause rock layers to fold on top of each other