Which is the approximate measure of this angle?
a.
30°
b.
45°
c.
80°
d.
120

answer at the divergent plate boundary in the middle of the ocean;

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.