What are the common elements present on the planet Triton and their states of matter?

Triton, Neptune's largest moon, primarily consists of water ice and rocky material, indicating a composition rich in silicate minerals. Its surface features include frozen nitrogen and methane, which exist as ices, while the subsurface may contain a liquid ocean of water beneath its icy crust. Additionally, Triton has a thin atmosphere composed mainly of nitrogen, with traces of methane, which exists as a gas.