text: In addition to Saturns methane cycle some studies suggest an ammonia cycle induced by photolysis similar to Jupiters.
  The cycles of its moons are of particular interest. Observations by Cassini–Huygens of Titan's atmosphere and interactions with its liquid mantle give rise to several active chemical cycles including a methane, hydrocarbon, hydrogen, and carbon cycles. Enceladus has an active hydrological, silicate and possibly a nitrogen cycle.