Given a scientific passage and an answer, generate a question for the given answer.

Input: Consider Input: Passage: Wavelength is one way of measuring the size of waves. It is the distance between two corresponding points on adjacent waves, and it is usually measured in meters. How it is measured is a little different for transverse and longitudinal waves. Answer: waves

Output: What do wavelengths measure the size of?

Input: Consider Input: Passage: The convection zone surrounds the radiative zone. In the convection zone, hot material from near the Sun's center rises. This material cools at the surface, and then plunges back downward. The material then receives more heat from the radiative zone. Answer: convection zone

Output: Hot material from near the sun's center rises in which zone?

Input: Consider Input: Passage: Frost is solid water that forms when water vapor undergoes deposition. Answer: frost
Output: What is solid water that forms when water vapor undergoes deposition?