Metals like iron, cobalt, and nickel are always magnetic, meaning their domains are lined up permanently.
Certain objects, like paper clips, are magnetic only when they come into contact with magnetic objects. They have domains but they are not lined up unless contacted by a magnetic object.
Non-magnetic materials such as wood have no domains and can never be magnetic.
in the inner and outer core are spinning and flowing. Because moving charges create magnetic fields, this movement in the Earth's core creates its natural magnetic field.
