Final answer:
Titan's dense atmosphere allows liquid hydrocarbons such as methane and ethane to mimic Earth's water cycle.
Step-by-step explanation:
The thick atmosphere on Saturn's moon Titan creates enough pressure to allow liquid hydrocarbons, specifically methane and ethane, to mimic the water cycle on Earth. Titan is notable for having an atmosphere denser than Earth's which consists primarily of nitrogen, with methane accounting for about 5% of the composition. The Cassini-Huygens mission provided imagery which confirms the presence of lakes and rivers made of liquid hydrocarbons near Titan's polar regions and evidence for a cycle involving the evaporation and condensation of these compounds, similar to Earth's water cycle but occurring at much lower temperatures.