Detailed Instructions: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Problem: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 .
Solution:
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 .