If earth was a marble, how large would mars be?

earth is not that much bigger than mars, so mars would be a smaller marble

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;