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The Hydrological Cycle is the main source of water. This cycle is very important in the regions where climate changes very often. This helps maintain relation between plants and animals and their adaptation too.

The hydrological cycle is the sum total of all processes in which water moves from the land and ocean surface to the atmosphere and back in form of precipitation.It is also known as the water cycle.

Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage-basin management, and water quality.

The hydrological cycle is the central theme of the study of hydrology. mathematical principles to solve water related problems. The major branches of hydrology include: chemical hydrology, ecohydrology, surface hydrology, hydrogeology amongst others.

The hydrologic cycle involves the continuous circulation of water in the Earth-Atmosphere system. At its core, the water cycle is the motion of the water from the ground to the atmosphere and back again.

THE WATER CYCLE. EVAPORATION. CONDENSATION. PRECIPITATION. INTERCEPTION. INFILTRATION. PERCOLATION. TRANSPIRATION.

"Hydro" means water and "logy" means science. Hydrology is concerned with the circulation of water and its constituents through the hydrologic cycle. It deals with precipitation, evaporation, infiltration, groundwater flow, runoff, streamflow and the transport of substances dissolved or suspended in flowing water.

The hydrologic cycle describes the contin- uous movement of water above, on, and below the surface of the Earth. The water on the Earth's surface—surface water—occurs as streams, lakes, and wetlands, as well as bays and oceans. Surface water also includes the solid forms of water— snow and ice.