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.

[Q]: 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 .
[A]: 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 .

[Q]: Plessy argued that the state law which required East Louisiana Railroad to segregate trains had denied him his rights under the Thirteenth and Fourteenth Amendments to the United States Constitution .
[A]: The State of Louisiana " , Plessy 's lawyers argued that the state law which required East Louisiana Railroad to segregate trains had denied him his rights under the Thirteenth and Fourteenth amendments of the United States Constitution , which provided for equal treatment under the law .

[Q]: The Miami metropolitan area includes Miami-Dade County , Broward and Palm Beach counties in southeastern Florida .
[A]:
The Miami metropolitan area consists of three distinct metropolitan divisions , subdividing the region into three divisions according to the region 's three counties : Miami-Dade County , Broward County , and Palm Beach County .