What is hydrological cycle?
From the beginning of time when water first appeared, it has been constant in quantity and continuously in motion. Little has been added or lost over the years. The same water molecules have been transferred time and time again from the oceans into the atmosphere by evaporation, dropped upon the land as precipitation, and transferred back to the sea by rivers and groundwater. This endless circulation is known as the hydrologic cycle. At any instant, about 5 liters out of every 100,000 liters is in motion. Over time, major cyclic changes in climatic processes have produced deserts and ice cover across entire continents. Today, regional short-term fluctuations in the order of days, months or a few years in the hydrologic cycle result in droughts and floods.
