The Plumes That Were Seen Rising from the Surface of Triton

Multiple Choice

The plumes that were seen rising from the surface of Triton, Neptune's largest satellite, are believed to be

A) nitrogen gas driven through fissures from beneath the surface by radioactive heat.
B) volcanic ash from eruptions similar to but much smaller than Earthbound eruptions.
C) sulfur dioxide from geysers heated by tidal stresses.
D) water, methane, and ammonia ice crystals above volcanic vents.