Earth's Water and the Hydrologic Cycle
The Hydrologic cycle is a closed loop system.
Demonstration from Poland Spring
Within the basic cycle, water is also returned the atmosphere by:
Where is all the Water?
The Earth's two main reservoirs of fresh water are the great polar ice caps and the ground. All ground water, found in aquicludes and aquifers, contains trace amounts of dissolved minerals such as calcium and magnesium. Hard water has a high concentration of minerals being greater than 60 parts per million (ppm). Hard water doesn't lather well with soap, is difficult on fabrics, and can leave mineral deposits inside plumbing and boilers.
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