Pluto is made of ice and rock because it stays -365 F deg. below 0. Pluto is made of the leftovers of when the Sun was formed. Under the surface of Pluto is water. Because the core is hot it does not freeze. If Pluto got -94.F degrees more the atoms would stop moving.
Here is some stuff I found about what Pluto is made of. From a cool site my dad found.
Pluto's composition is unknown, but its density (about 2 gm/cm3) indicates that it is probably a mixture of 70% rock and 30% water ice much like Triton. The bright areas of the surface seem to be covered with ices of nitrogen with smaller amounts of (solid) methane, ethane and carbon monoxide. The composition of the darker areas of Pluto's surface is unknown but may be due to primordial organic material or photochemical reactions driven by cosmic rays.
Little is known about Pluto's atmosphere, but it probably consists primarily of nitrogen with some carbon monoxide and methane. It is extremely tenuous, the surface pressure being only a few microbars. Pluto's atmosphere may exist as a gas only when Pluto is near its perihelion; for the majority of Pluto's long year, the atmospheric gases are frozen into ice. Near perihelion, it is likely that some of the atmosphere escapes to space perhaps even interacting with Charon. NASA mission planners want to arrive at Pluto while the atmosphere is still unfrozen.
SourcePluto l Pluto facts, pictures and information. by nineplanets.org
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