State two factors that determine whether a planet will have an atmosphere or not.
(N/A) The two factors responsible for the presence of an atmosphere on a planet are:
$(i)$ The acceleration due to gravity on the planet.
$(ii)$ The temperature on the surface of the planet.
This is because the speed of gas molecules depends on the temperature of the planet.
$(i)$ The acceleration due to gravity on the planet.
$(ii)$ The temperature on the surface of the planet.
This is because the speed of gas molecules depends on the temperature of the planet.
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