Cotopaxi is the
question 7 options:

smallest city in south america.

volcano located on "volcano boulevard."

highest waterfall in the world.

southernmost city of south america.

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.