Question

Dear expert,

Why does the earth's magnetic field not lose its property even though the core is hot? (becauseI learnt that magnets lose its property when heated)

Answer 1

Earth’s magnetism is not due to the phenomenon of ferromagnetism (materials that magnets are made of) that losses magnetism on heating. Earth’s magnetic field is created due to the motion of electric charges in the molten material inside the earth. The field is sustained because of the convective motion of the molten material inside the earth and earth’s rotational motion, as because earth’s rotation and inner temperature is nearly constant over millions of years that is why the earth’s magnetic field do not go away.