It wasn't until 2015 that China finally finished building the Three Gorges Dam. When it comes to hydroelectric power plants, this one is the biggest in the world. Because of its massive size, the dam temporarily retarded Earth's rotation by 0.06 microseconds.
The concrete and steel used to construct the dam are the main materials. There was enough steel used to build 63 Eiffel Towers in the dam's construction (463,000 metric tonnes). The dam required a whopping 27.3 million cubic metres of concrete to build. It was estimated that some 102.3 million cubic metres of earth had to be moved to make place for the extra water. There is a distance of 594 feet (181 metres) between the basement and the exterior wall of concrete.
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