instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Monarch butterflies gather in large groups as they migrate 2,500 miles south each fall. They return to the north in the spring. This migration is a cycle that repeats every year. Answer: migration
answer:
What do we call the seasonal movement of animals?

question:
Passage: The hard drive is a magnetic disc that provides long-term storage for programs and data. Answer: hard drive
answer:
What device is a magnetic disc that provides long-term storage for programs and data?

question:
Passage: In other materials, there are regions where the north and south poles of atoms are all lined up in the same direction. These regions are called magnetic domains . Generally, the magnetic domains point in different directions, so the material is still not magnetic. However, the material can be magnetized (made into a magnet) by placing it in a magnetic field. When this happens, all the magnetic domains line up, and the material becomes a magnet. You can see this in the Figure below . Materials that can be magnitized are called ferromagnetic materials . They include iron, cobalt, and nickel. Answer: magnetic domains
answer:
The regions of a material where the north and south poles of atoms are aligned are called what?