While it's true that Pluto has a thin atmosphere made of nitrogen, methane, and carbon monoxide, this atmosphere is very faint and doesn't make up the majority of the dwarf planet.

Here's a breakdown:

* Rock: Pluto's core is believed to be made of rock, about 70% of its total mass.

* Ice: The outer layers of Pluto are primarily made of various ices, such as water ice, nitrogen ice, methane ice, and carbon monoxide ice. These ices are what give Pluto its reddish-brown color.

* Gas: Pluto's atmosphere is very thin and composed mostly of nitrogen, with traces of methane and carbon monoxide.

So, while Pluto does have a gaseous component, it's mostly rock and ice, making it a rocky/icy body.