Covered cisterns were used to store water for use in dry spells. Unfortunately, these elaborate water systems were destroyed during wars and after the fall of the Roman Empire it took many years before any were built that came close to these standards. In the 19th century before the Industrial Revolution most people lived in villages and small towns without danger of using up or polluting the water sources...
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After the Industrial Revolution there were large populations of people concentrated in cities where many water supplies were either short or polluted. Once these cities were established it was impossible to abandon them in search of a better water source so often times large quantities of water were transported hundreds of miles to supply existing cities...
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Water Pollution A point source pollutant is a harmful substance that enters the water source directly such as an oil spill. A non point source pollutant is a pollutant that enters the water source indirectly through environmental changes such as fertilizer run off washed in by rainwater...	5 / 1365
Announcement For Pollution Ground water pollution occurs when harmful elements, such as oil, debris, chemicals and other contaminants get washed up by rainwater and then seep back into underground water supplies called ground water...	3 / 639
Pollution Outdoor pollution is the most harmful. Most of it is caused by motor vehicles. Some air pollution also comes from business and industrial processes. For example, many dry cleaning plants remove dirt from clothing with a chemical called perchloroethylene, a hazardous air pollutant...	3 / 701
Water Pollution petroleum, inorganic materials, nuclear power plants, industrial sites, medical and scientific use of radioactive materials. Water pollution was originally caused by need of space (to dump trash)...	3 / 690