Question

What is the major cause of earths magnetic field

Answer 1

When the liquid metal that creates the outer core of the earth passes through a magnetic field, it begins to carry the electric current through the liquid. This current makes its own, much stronger magnetic field.

Answer 2

Convection cells in earth's outer core

Step-by-step explanation:

Earth's outer core is liquid and it has a lot of highly conductor melted iron that is flowing, making spiral roads of electric current that generates a magnetic field, that in this case works like a magnetic dipole with a north and a south pole.

The earth's magnetic field protects the earth from the solar vents.