Final answer:
The statement about Triton having active volcanoes of liquid nitrogen is true. Nitrogen geysers have been observed on Triton, which are energized by sunlight warming its surface. Triton's polar cap evaporates to form plumes of nitrogen gas, differing from the internal heat-driven volcanic activity on moons like Io.
Step-by-step explanation:
The statement that Triton, one of Neptune's moons, has active volcanoes of liquid nitrogen is true. Voyager's images provided evidence that Triton's polar cap, which may consist of frozen nitrogen, evaporates and creates geysers or volcanic plumes of nitrogen gas. These plumes can reach up to 10 kilometers high, a phenomenon made visible by dust from Triton's surface that rises with the gas and darkens them. Although Triton's environment is extremely cold by Earth standards, these plumes are energized by the sunlight warming the surface rather than internal heat, in contrast to the volcanic plumes observed on Io, which are powered by internal geological heat.
With a high reflectivity of about 80%, most of the solar energy is reflected away from Triton, yet enough sunlight reaches the moon's surface to warm and evaporate nitrogen from the polar cap. This results in the unique and active geological processes observed on Triton, which has a thin atmosphere and is composed mostly of rock with a significant amount of water ice). Triton's geological activity hints at a complex history and a surface that has been reshaped by multiple processes, including the localized flow of "lava" that may consist of substances like water or water-ammonia mixtures.