question: Write a question you would see in a school textbook. OPTIONS:
- mirror
- silver spoon
- foil
- glass prism
answer: Which object refracts light?

question: Write a question you would see in a school textbook. OPTIONS:
- mass
- volume
- shape
- distance between particles
answer: Which of the following properties of a substance is conserved during thermal expansion?

question: Write a question you would see in a school textbook. OPTIONS:
- novas
- galaxies
- black holes
- solar systems
answer:
Which discovery revealed that the universe contains many structures composed of millions of stars?