veinus
Venus
Mars is known as the red planet. The planet itself is mostly rock. It is the thin atmosphere that is mostly carbon dioxide.
Venus .
Venus has a poisonous atmosphere composed mainly of carbon dioxide with traces of sulfuric acid.
Mars, Venus's atmosphere is thicker than Earth's. Much thicker.
Earth
The scientific name for the gasses that surround a planet is atmosphere. The atmosphere of earth is made of nitrogen, oxygen, and carbon dioxide.
Venus has a dense carbon dioxide atmosphere and high surface temperatures, with an average surface temperature of about 467 degrees Celsius (872 degrees Fahrenheit). This extreme greenhouse effect is due to the trapping of heat by the carbon dioxide in the atmosphere.
Mars is the only planet that is thin and is made up of only carbon dioxide. :) (Question to asker): Define "thin" at what part of it is made of CO2? But you probably mean the atmosphere so in that case then the answer above is correct... mostly.
The atmosphere of Venus is made up of primarily of carbon dioxide. Thick clouds of sulphuric oxide and carbon dioxide completely cover the planet.
The planet is likely Venus, which has an atmosphere composed primarily of carbon dioxide. This high concentration of carbon dioxide contributes to a runaway greenhouse effect, resulting in extreme surface temperatures and a dense, opaque atmosphere.
The inner planet that has an atmosphere containing mostly carbon dioxide is Venus. It has an extremely dense atmosphere, made up mostly of carbon dioxide with small amounts of nitrogen and trace amounts of other gases. The thick atmosphere contributes to Venus' extreme greenhouse effect, making it the hottest planet in the solar system.