The hydrologic cycle describes the continuous movement of water above, on, and below the surface of the Earth. Animated diagram of groundwater, water cycle, and water wells. The Hydrologic (or Water) Cycle is a dynamic system. The total amount of water remains essentially constant. Groundwater and surface water are essentially one resource, physically connected by the hydrologic cycle in which water evaporates, forms clouds, and falls to the ground as rain or snow. The water on the Earth's surface--surface water--occurs as streams, lakes, and wetlands, as well as bays and oceans. It is a closed system, meaning that nothing can be lost, it can only be relocated to another part of the system. Eventually groundwater emerges back to the surface and continues to participate in the global water cycle. Water cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Back to the water cycle diagram for students. The water cycle describes how Earth's water is not only always changing forms, between liquid (rain), solid (ice), and gas (vapor), but also moving on, above, and in the Earth. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. The components of groundwater in hydrologic cycle for any area can be represented by an equation: ∆s= recharge – discharge . This process is always happening everywhere. The Hydrologic Cycle and Interactions of Ground Water and Surface Water. Published: Tuesday, 14 August 2012 15:42 The Role of Groundwater in the Hydrologic Cycle. Groundwater is the water that fills cracks and other openings in beds of rocks and sand. Thus hydrologic cycle is completed. Each drop of rain that soaks into the soils moves downward to the water table, which is the water level in the groundwater reservoir. Some of this precipitation seeps into the ground and moves slowly into an underground aquifer, eventually becoming groundwater. The water cycle, also known as the hydrologic cycle or the H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth. The Water Cycle for Schools and Students: Advanced students. Groundwater does not normally occur in underground streams, lakes, or veins. Groundwater recharge also encompasses water … Groundwater starts as precipitation, just as surface water does, and once water penetrates the ground, it continues moving, sometimes quickly and sometimes very slowly. When sufficient water vapour gathers in the atmosphere the cycle again repeats. Many jobs related to groundwater offer opportunities for field work, and the integration of other skills-sets, for example, many environmental groundwater specialists also work in wetlands delineation and surface water fields. 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