Londoa magnet is attracted towards it showing that there is existence of magnetic field of Earth.
Step-by-step explanation:
The core of the planet Earth has it's own magnetic field and because of this there is some permanent kind of magnetization of this planet. This leads to the attracting of the magnets towards the magnetic field of planet Earth.
At the Equator, the direction of the magnetic field of Earth is pointing towards the north direction and at this point the position of the magnetic field of Earth is horizontal. This has been shown and proven with the help of a use of a compass.