Heat moves through the atmosphere through the process of

a. convection
b. conduction
c. radiation
d. refraction

C. radiation

Explanation:

There are three modes of transfer:

1. Conduction: This type of heat transfer happens when there is direct contact between the two object.

2. Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) in which convection currents are produced due to the movement of hot fluid upwards and cold fluid downwards. This happens as the density of hot fluid decreases and thus it moves upwards.

3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.  

Thus heat moves through the atmosphere through the process of radiation

the answers are a and c