What is 40 degrees north and 76 degrees west?

If you look up the coordinates 40 degrees north and 76 degrees west, you will land almost directly in the center of Pennsylvania.

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.