The magnetic field is believed to be generated by electric currents in the conductive material of its core, created by convection currents due to heat escaping from the core. So your answer is A
The most common compound on earth is cellulose because it has enough energy to be the next source for biofuels.
The answer is Conduction. I hope this helps!
Dangerous
hope i helpedXD
One possible answer could be that a chemical reaction has occurred.