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The Great Wall of China
China started building walls because the seven Kingdoms were at war in 800 B.C.E. -
Jan 1, 690
The Great Wall of China
Emperor Quin Shi Huang built a north wall to defend against the Mongols in 220 B.C.E. -
Jan 1, 700
The Great Wall of China
The length of the norther wall was 3,100 in 210 B.C.E., 10 years later. -
Jan 1, 1368
The Great Wall of China
The Chinese got rid of the Mongols and made stronger walls in 1368. -
Openpit Mining
China's state owned Coal Mines used Openpit Mining starting in 1949. -
Three Gorges Dam
The real planning for the Three GOrges Dam started in 1955. Many people had concerns and they delayed work for 40 years. -
Openpiy Mining
China's state owned Coal Mines stopped using Openpit Mining in 1980. -
Area Type Mining
Area Type Mining was used in surface coal mines after 1980. -
Three Gorges Dam
The Three Gorges Dam began in 1994. -
Three Gorges Dam
In 2003, the hydroelectric power started. -
Three Gorges Dam
The main wall on the Three Gorges Dam was complete in 2006. -
Three Gorges Dam
As of 2006, the Three Gorges Dam was the largest dam structure in the world. -
Strip Mining
Coal production was 3.24 billion tons in 2010 and surface mining was about 9% of that.