The journey of a water molecule as it leaves the ocean and returns on land as precipitation.
Solar energy heats up the water, causing it to evaporate. Water molecules rise up and enter the atmosphere
In the clouds, water molecules cool due to the reduced temperature and stick together in the process of condensation.
When the cloud is too heavy with water, gravitation causes water molecules to fall back to the land as precipitation. Some of the molecules will fall directly into the water, while others will become runoff or seep into the ground.