Groundwater or ground water is the water which flowing beneath Earth’s surface in soil pore spaces and in the fractures of rock. Groundwater is recharged from springs and seeps, and can form oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal, and industrial use by constructing and operating extraction wells. The study of groundwater is hydrogeology,
Usually groundwater is idea of as water flowing through shallow aquifers, non the less it can also contain soil moisture, frozen soil. Also water can be immobile in very low permeability bedrock, and deep geothermal or oil formation water. As a hypothesize, groundwater provide lubrication which can possibly influence the movement of faults.
Groundwater is usual cheaper, more convenient and less vulnerable to pollution than surface water. Therefore, Groundwater is commonly used by people for their supplies. For example, groundwater gives the largest source of usable water storage in the United States. An enormous amount of groundwater is withdrawing for different need in California. It happens every year. Researches show to us that underground water resources are large than arrearage of water on the surface on our planet in US.
Many municipal water supplies are derived solely from groundwater.
If groundwater is polluted, it is very difficult to find it out and then to clear it up. This process is more difficult than clearing up lakes or rivers. Polluted groundwater is often the result of disposal of wastes on land. Industrial and household chemicals, garbage landfill, excessive fertilizers and pesticides used in agriculture, industrial waste lagoons, tailings and process wastewater from mines, industrial fracking, oil field brine pits, leaking underground oil storage tanks and pipelines, sewage sludge and septic systems are the most main reasons of pollution groundwater.