Answer: Layer's of the Sun.
Explanation:
The three words of the list correspond to the layers of the interior and atmosphere of the Sun.
This briefly tells you what every layer is:
Core: it is the central zone of the zone.
There is where the nuclear reactions (fusion) that transform hydrogen into helium and produce vast amounts of energy occur.
Radiation zone:
Is a very hot region in the interior of the sum where electromagnetic radiation is the mechanism of heat energy transference.
Convection zone
It is the outermost layer of the interior of the Sun, which is less dense than the radiation zone and the main heat transference mechanism is convection.
