The diagram which has been presented illustrates the circulation of the water on, above and below the Earth’s surface.
From an overall perspective, there are three main stages shown on the diagram. Ocean water evaporates, falls down as rain and finally flows into the ocean again.
To begin with, in the evaporation stage, we can realize that the vast majority of water vapor in the air stemming from the ocean. The heat of the sun makes water evaporate, then water vapor forms clouds. At the second procedure, water vapor condensing in the cloud falls as rain or snow.
Eventually, rainwater has several ways to turn back into the ocean. It can fall down and create the lakes; otherwise, water returns to the ocean by osmose via surface runoff. In the other way, the flow of rainwater may filter through the ground and then reach the impervious layer of the planet. After the salt water intrusion is shown to take place, groundwater returns into the ocean and ends the process of circulation.
