Book, Experiments With Magnets By Helen J. Challand pgs. Most scientists think it is the way iron is made.
Iron looks hard, but it is actually made of many tiny, tiny moving bits called molecules.
They are moving all the time, but they are so small that you can t see them move. Each molecule of Iron is a tiny magnet, but since Iron is made of many molecules, all of the molecules are pulling in different directions, so there is no magnetic force or pull. Now think of four people pulling in the same direction, they have a lot of force. So, magnets are made by lining up all of the Iron molecules in one direction, and that gives them the force they need to pull things towards them. Have children form groups of two.