![]() However, microbes, viruses, and bacteria do not die just from being underground, nor are any agricultural or industrial pollutants removed. If underground long enough, lack of sunlight causes most algae and water plants to die. The water is crudely filtered in the rock, and the time spent underground allows debris and mud to fall out of suspension. The temperature of an Ozark spring comes from its passing through rock at a mean annual temperature of 56 degrees Fahrenheit. So, should you feel confident about whipping out your canteen and filling it with cool and refreshing spring water? No, you should be cautious. The rate of flow and the length of the flowpath through the aquifer affects the amount of time the water is in contact with the rock, and thus, the amount of minerals that the water can dissolve. The quality of water discharged by springs can vary greatly because of factors such as the quality of the water that recharges the aquifer and the type of rocks with which the groundwater is in contact. The quality of the water in the local groundwater system will generally determine the quality of spring water. Influx of metal-rich groundwater from natural springs (foreground) to Cement Creek, Colorado (background). This water is cold and clear-is it fit to drink? If surface water enters the aquifer near a spring, the water can move quickly through the aquifer and discharge at the spring vent. In Florida, many surface waters contain natural tannic acids from organic material in subsurface rocks, and the color from these streams can appear in springs. Its red iron coloring and metals enrichment are caused by groundwater coming in contact with naturally occurring minerals present as a result of ancient volcanic activity in the area. Water from some springs, however, may be "tea-colored." This picture shows a natural spring in southwestern Colorado. Water from springs usually is remarkably clear. But springs can occur when geologic, hydrologic, or human forces cut into the underground layers of soil and rock where water is in movement. Most people probably think of a spring as being like a pool of water-and normally that is the case. Groundwater withdrawals in an area can cause water levels in the aquifer system to drop, ultimately decreasing the flow from the spring. Human activities also can influence the volume of water that discharges from a spring. The amount of water that flows from springs depends on many factors, including the size of the caverns within the rocks, the water pressure in the aquifer, the size of the spring basin, and the amount of rainfall. This process often takes tens to hundreds of thousands of years to complete. As the process continues, the water hollows out more rock, eventually admitting an airspace, at which point the spring stream can be considered a cave. When it reaches a horizontal crack or a layer of non-dissolving rock such as sandstone or shale, it begins to cut sideways. When weak carbonic acid (formed by rainwater percolating through organic matter in the soil) enters these fractures it dissolves bedrock. Both dolomite and limestone fracture relatively easily. In Missouri, the largest springs are formed in limestone and dolomite in the karst topography of the Ozarks. Springs may be formed in any sort of rock. The hot water (over 300 degrees Celsius) coming from these springs is also rich in minerals and sulfur, which results in a unique ecosystem where unusual and exotic sea life seems to thrive. Recently, scientists have discovered hot springs at depths of up to 2.5 kilometers in the oceans, generally along mid-ocean rifts (spreading ridges). ![]() Springs are not limited to the Earth's surface, though. They range in size from intermittent seeps, which flow only after much rain, to huge pools flowing hundreds of millions of gallons daily. A spring is the result of an aquifer being filled to the point that the water overflows onto the land surface. A spring is a water resource formed when the side of a hill, a valley bottom or other excavation intersects groundwater at or below the local water table, below which the subsurface material is saturated with water.
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