GEOLOGY Pluto's geology reveals a diverse terrain with frozen plains, mountains, and vast icy plains. The heart-shaped Tombaugh Regio, dominated by nitrogen ice, contrasts with darker, rugged areas like Cthulhu Macula. Geologically active, evidence suggests cryovolcanism—icy eruptions shaping its surface. Mountains, possibly composed of water ice, rise kilometers high. Subsurface layers may harbor an ocean. Tectonic activity creates fault lines and fractures, while seasonal changes cause volatile ices to shift, influencing Pluto's ever-evolving geological landscape. The interplay of geological processes involving ice, organic compounds, and subsurface interactions shapes Pluto's unique geology.