It cannot have arisen out of the same solar nebula that yielded the body it orbits, evidence by its retrograde rotation, leading most astronomers to conclude that this moon is a capture Kuiper Belt object.  
High plains on this planet are dotted with pits like the Leviathan Patera, indicating huge flows of possibly ammonia-based lava.  This topography, combined with geologic diapir activity, casues the "canteloupe" appearance of this body, which may actually have atmospheric winds as evidence by the streaked pattern of geyser residue.  It cannot have arisen out of the same solar nebula that yielded the body it orbits, evidence by its retrograde rotation, leading most astronomers to conclude that this moon is a capture Kuiper Belt object.  Cryovolcanism runs rampant on, for 10 points each, what coldest body in the solar system, the largest moon of Neptune?
High plains on this planet are dotted with pits like the Leviathan Patera, indicating huge flows of possibly ammonia-based lava.  
Triton