Atmosphere    

On Mars
  Mars' atmosphere is very thin. It about 100 times less dense than Earth's. There aren't  any clouds of water vapor, only a bit of water-ice clouds. Clouds that are found on Mars'  surface are made mainly from carbon dioxide-ice clouds and dust.
This pictures shows Mars' atmosphere. It is very thin compared to Earth.

 

This picture shows the structure of Mars' atmosphere.
  
  The Atmospheric Pressure on Mars is very low, but there is evidence that the pressure wasn't always this low. Evidence shows that there was at one time plenty of volcanism to release carbon dioxide. The carbon dioxide thickens the atmosphere, therefore increasing the pressure.

The fact that Mars is further away from the sun allows for very cold conditions and therefore water freezes very easily. Since it is so cold carbon dioxide also freezes and does not aid in the greenhouse effect. If the atmosphere were to become thick enough for sufficient greenhouse warming to facilitate liquid water periodically at the surface, the CO2 would get removed as carbonates and would help warm the atmosphere to a hospitable temperature.

 

 

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