The interaction of this solid iron and the molten outer core may create the Earth's magnetic field and cause the needle of a compass to point north.
(The interaction of this solid iron and the molten outer core; may create; the Earth's magnetic field) (The interaction of this solid iron and the molten outer core; cause; the needle of a compass)
The interaction of this solid iron and the molten outer core The interaction of this solid iron and the molten outer core
may create cause
the Earth's magnetic field
the needle of a compass