Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Light is one type of electromagnetic radiation . Light is energy that travels in the form of an electromagnetic wave. Figure below shows a diagram of an electromagnetic wave. An electromagnetic (EM) wave has two parts: an electric field and a magnetic field. The electric and magnetic fields vibrate up and down, which makes the wave. Answer: electromagnetic
Output:
Light is energy that travels in the form of what type of wave?