Question

if you have ever used a compass, you know that it can be used to help navigate. It does this with a needle that always points north, so you know which direction you are heading. The needle points to the north because earth is like a giant magnet, with both north and south poles. According to current theory, the creation of earth's magnetic field is closely linked to

Answer 1

a dynamo.

The dynamo theory is the most accepted theory today for the explaining of the Earth's magnetic field. The dynamo theory states that it is through a fluid (that rotates, convects and is electrically conducting) that is created and maintained a magnetic field around the Earth. It is believed that's what happens also on other planets.