question: Write a question you would see in a school textbook.
answer: Which force produces energy as heat?

question: Write a question you would see in a school textbook.
answer: Phyllis investigated what happened when she added some different substances to water. Which substance can combine with water to form a solution?

question: Write a question you would see in a school textbook.
answer:
Which gas, when condensed into its liquid state in the atmosphere, forms clouds?