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

Ex Input:
Passage: Power plants are where electric power originates. They have electric generators that generate electric current through electromagnetic induction. Answer: power plants

Ex Output:
Where does electric power originate?

Ex Input:
Passage: Electromagnetic waves vary in their wavelengths, frequencies, and energy levels. The full range of electromagnetic waves makes up the electromagnetic spectrum. Answer: electromagnetic spectrum

Ex Output:
What do we call the full range of electromagnetic waves?

Ex Input:
Passage: 16.11 Energy in Waves: Intensity 17. Two identical waves undergo pure constructive interference. Is the resultant intensity twice that of the individual waves? Explain your answer. Circular water waves decrease in amplitude as they move away from where a rock is dropped. Explain why. Answer: amplitude

Ex Output:
Circular water waves decrease in what property as they move away from where a rock is dropped?