Problem: Write a question you would see in a school textbook.

Answer: A light-year is a measure of

Problem: Write a question you would see in a school textbook.

Answer: Sound waves can pass through all of these except

Problem: Write a question you would see in a school textbook.

Answer:
A student learns that one year on Mercury is about 88 Earth days. This means it takes 88 Earth days for Mercury to