Water is abundant on the earth's surface. It covers about 70 percent of the earth's surface. Making up oceans, lakes, rivers, and glaciers Water present under the earth's surface is called ground water (its upper most level is called the water table). The United States withdraws 339 billion gallons of ground and surface water a day. Water is linked with the moon through the movement of tides.
Water Erosion Result
Flowing water is a major erosion force of the land. Water is one of the best-known solvents in natural waters where various substances are found in a dissolved state. Hence, for drinking purposes, water may need to be purified. Mineral water contains a great variety and quantity of materials (usually compounds of calcium, magnesium, or iron). When water contains a lot of calcium and magnesium, it is called hard water. The less calcium and magnesium in the water ("soft" water), the easier it is to create lather and suds.
In many places water occurs in "natural spring". Such springs may result where surface water has penetrates the ground surface and becomes part of the underlying groundwater. The ground water then travels through a labyrinth of cracks and fissures. The geologic formations containing water are known as aquifers. Once the cracks reach the surface, the water flows to the surface as a spring. Each such spring has its own characteristics and water analysis. The temperature of the spring water may be hot or cold. The spring water may stay underground for many years or decades. Hence, it absorbs various trace elements and minerals that affect the taste of the water. The taste of spring water reflects different geologic strata the water travel through sometimes over a year or two and others for over centuries. During this travel water absorbs minerals and trace elements that may give it a metallic taste or a "rotten egg" taste.