Because it has to precipitate so it can support the planet, just like Earth. There's no question about it.
Carbón dioxide gas
The atmosphere is made mostly of gas because gases have low molecular densities, allowing them to be easily suspended in the Earth's gravity. The gases in the atmosphere help regulate temperature and provide elements essential for life, such as oxygen.
carbon dioxide
This is a little like asking 'Why is iron mostly metal?' Atmospheres are made up of gas.
it is mostly made of rock I don't think there is really any gas but its atmosphere.
The four outer gas giants.
No Mars is composed mostly of rock. The atmosphere is very thin.
helium
No. Mars has a very thin atmosphere. It is mostly made of rock and metal, as it has a metallic core.
Mars is a rocky planet with very little atmosphere.
The atmosphere is the mixture of gas molecules and other materials surrounding the earth. It is made mostly of the gases nitrogen (78%), and oxygen (21%).
Mars is mostly made of rock. It has a thin atmosphere composed mostly of carbon dioxide, but the majority of its mass is solid material, consisting of silicate rocks and metals.