The correct option is Precipitation.
Explanation
The hydrological cycle involves the continuous exchange of water between the atmosphere, land, and oceans. This cycle relies on phase changes of water, primarily evaporation, condensation, and precipitation.
Analysis of Options:
- Saturation is incorrect: Saturation occurs when a volume of air at a given temperature holds the maximum amount of water vapour it is capable of holding. It is a condition that leads to condensation but is not the release of moisture itself.
- Precipitation is correct: Precipitation is the release of moisture from the atmosphere to the earth's surface. It occurs after the condensation of water vapour causes water droplets or ice crystals in clouds to grow large enough that the air can no longer hold them against gravity.
- Sublimation is incorrect: Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
- Evaporation is incorrect: Evaporation is the process by which water changes from a liquid to a gas or vapour. It is the primary mechanism through which moisture enters the atmosphere, rather than being released from it.
Key Takeaway: Precipitation is the final stage in the atmospheric water cycle where condensed moisture falls back to the surface in liquid or solid forms, such as rain, snow, or hail.