The pull of gravity on earth is a direct result of the:
a. mass of earth
b. magnetic field of earth
c. rotation of earth on its axis
d. weight of earth's atmosphere

i think it's severe storms but i might be wrong

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.