The earth's magnetic field

varies in direction but not in magnitude

varies in magnitude but not in direction

varies in both magnitude and direction

is centred exactly about the centre of the earth

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Solution

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The magnetic field around the earth is like that around the bar magnet as shown.
The magnetic lines of force emerge from geographic south pole and enter the north pole forming closed loops. Hence the magnetic field changes in both magnetic and direction at all points.

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The earth's magnetic field

The magnetic field around the earth is like that around the bar magnet as shown. The magnetic lines of force emerge from geographic south pole and enter the north pole forming closed loops. Hence the magnetic field changes in both magnetic and direction at all points.

The magnetic field around the earth is like that around the bar magnet as shown.
The magnetic lines of force emerge from geographic south pole and enter the north pole forming closed loops. Hence the magnetic field changes in both magnetic and direction at all points.