The rotation of the Earth's core

The movement of tectonic plates

The Earth's atmosphere

The Earth's oceans

It is uniform and constant

It is constantly changing

It is strongest at the equator and weakest at the poles

It is strongest at the poles and weakest at the equator

The points on the Earth's surface where the magnetic field is strongest

The points on the Earth's surface where the magnetic field is weakest

The points on the Earth's surface where the magnetic field is vertical

The points on the Earth's surface where the magnetic field is horizontal

The region of space around the Earth where the Earth's magnetic field is dominant

The region of space around the Earth where the Sun's magnetic field is dominant

The region of space between the Earth and the Moon

The region of space between the Earth and Mars

To protect the Earth from harmful solar radiation

To regulate the Earth's climate

To generate the Earth's magnetic field

To create the aurora borealis and aurora australis

Natural light displays in the sky, caused by the interaction of the solar wind with the Earth's magnetic field

Natural light displays in the sky, caused by the interaction of the Earth's magnetic field with the Moon's gravity

Natural light displays in the sky, caused by the interaction of the Earth's atmosphere with the Sun's heat

Natural light displays in the sky, caused by the interaction of the Earth's atmosphere with the Moon's gravity

The angle between the magnetic north pole and the geographic north pole

The angle between the magnetic south pole and the geographic south pole

The angle between the magnetic north pole and the magnetic south pole

The angle between the geographic north pole and the geographic south pole

The angle between the magnetic field and the horizontal

The angle between the magnetic field and the vertical

The angle between the magnetic north pole and the geographic north pole

The angle between the magnetic south pole and the geographic south pole

The strength of the magnetic field

The direction of the magnetic field

The angle between the magnetic field and the horizontal

The angle between the magnetic field and the vertical

It causes compasses to point to the magnetic north pole

It causes compasses to point to the geographic north pole

It causes compasses to point to the magnetic south pole

It causes compasses to point to the geographic south pole

It helps animals navigate

It helps animals find food

It helps animals communicate

It helps animals reproduce

It can affect our sleep patterns

It can affect our mood

It can affect our health

It can affect our behavior

It can cause geomagnetic storms

It can damage satellites and other electronic devices

It can interfere with radio communications

All of the above

It will continue to weaken and eventually reverse

It will continue to strengthen and eventually reach a maximum

It will remain the same

It is impossible to predict

They are using satellites to measure the magnetic field

They are using ground-based observatories to measure the magnetic field

They are using paleomagnetic data to study the history of the magnetic field

All of the above