FIRST CONTACTS 28000 BCE 1821 CE
PRE COLUMBIAN AMERICA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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elaborate bridges
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stone wall structure
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aqueducts
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None of the above
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Detailed explanation-1: -aqueduct, (from Latin aqua + ducere, “to lead water”), conduit built to convey water. In a restricted sense, aqueducts are structures used to conduct a water stream across a hollow or valley.
Detailed explanation-2: -Aqueducts moved water through gravity alone, along a slight overall downward gradient within conduits of stone, brick, concrete or lead; the steeper the gradient, the faster the flow.
Detailed explanation-3: -They were made from a series of pipes, tunnels, canals, and bridges. Gravity and the natural slope of the land allowed aqueducts to channel water from a freshwater source, such as a lake or spring, to a city.
Detailed explanation-4: -There are dozens of known examples found in Europe, Africa and Asia. In France, a first century A.D. Roman aqueduct called the Pont du Gard delivered water over dozens of miles to the then Roman city of Nîmes.