Water is one of the necessities of life. The human body can only survive for three days without water. Even early civilization knew that water was needed. The civilizations that advanced faster where located closer to water, which helped them water their plants faster and sustain life longer. The civilizations that domesticated their animals and crops, ended up having more time on their hands. They came up with irrigation systems which gave them even more time on their hands. With the time on their hands these civilizations could advance in building up their culture and technology.
citation: "Miao Irrigation System." commons wikimedia. Web. 28 Jan 2010.
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