Which is evidence that supports the dynamo theory?

Earth's core is the evidence that supports the dynamo theory.

Explanation:

Dynamo theory explains how large bodies which are celestial have the power to attract because of the magnetic power present in them. It tells that the main inner area of the earth which is the core has magnetic field present in them and that is because that the core mostly consists of the iron.

It cause electric currents because of the motion of the iron and along with that it has nickle also and this leads to the creation of the magnetic fields also in this inner core.