None. By definition a rocky planet is mostly rock. Venus, by far, has the densest atmosphere of the terrestrial planets, but the planet itself is mostly rock and is similar in composition to Earth.
The largest planet is Jupiter, with an atmosphere made mostly of hydrogen.
Neptune (NovaNet) There's something wrong here. Neptune is mainly a hydrogen atmosphere. Earth is the planet with a mainly nitrogen atmosphere, but the coldest is Neptune.
Mars, Venus's atmosphere is thicker than Earth's. Much thicker.
Earth is the planet that fits this description. It contains approximately 70% water on its surface and its atmosphere is primarily composed of nitrogen, with oxygen being the second most abundant gas.
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.
Venus
Mars is known as the red planet. The planet itself is mostly rock. It is the thin atmosphere that is mostly carbon dioxide.
Planet Earth - about 80%.
The largest planet is Jupiter, with an atmosphere made mostly of hydrogen.
Neptune (NovaNet) There's something wrong here. Neptune is mainly a hydrogen atmosphere. Earth is the planet with a mainly nitrogen atmosphere, but the coldest is Neptune.
Earth
Mars is a rocky planet with very little atmosphere.
Mars, Venus's atmosphere is thicker than Earth's. Much thicker.
Mercury
It's rocky, but it has an atmosphere made up mostly of carbon dioxide and has clouds made of sulfuric acid.
Earth is the planet that fits this description. It contains approximately 70% water on its surface and its atmosphere is primarily composed of nitrogen, with oxygen being the second most abundant gas.
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.