Q: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
The magnetic field of the Earth , and of other planets that have magnetic fields , is generated by dynamo action in which convection of molten iron in the planetary core generates electric currents which in turn give rise to magnetic fields .
A:
The magnetic field of the Earth , and of other planets that have magnetic fields , is caused by dynamo action of molten iron in the planetary core .