Why do magnets attract iron?
user
Well, according to Newton's theory of gravity, which is still the most commonly-used theory of gravity, gravity is caused by the curvature of space-time.  It’s a complex issue, but to explain it more simply, the curvature of space-time makes mass bend space, and the more mass that’s present, the more space it bends, which causes a force.
assistant
Why do magnets attract iron?
user
It is based on the phenomena of magnetism, an unexplained force that exists between some metals and some materials.
assistant
Why do magnets attract iron?