Coordinates: 40°40′37″N117°13′55″E / 40.67693°N 117.23193°E / 40.67693; 117.23193
The Great Wall of China is an ancient wall in China. The wall is made of cement, rocks, bricks, and powdered dirt. It was built to protect the north of the empire of China from enemy attacks. It is the longest structure humans have ever built. It is about 21,196 kilometres (13,171 miles) long, 9.1 metres (30 feet) wide and 15 metres (50 feet) high. The earlier sections on the wall are made of compacted dirt and stone. Later in the Ming Dynasty they used bricks. There are 7,000 watch towers, block houses for soldiers and beacons to send smoke signals.
Nineteen walls have been built that were called the Great Wall of China. The first was built in the 7th century BC. The most famous wall was built between 226–200 BC by the first Emperor of Imperial China, Qin Shai Hong, during the Qin Dynasty. Not much of this wall remains as people have been stealing from it. It was much farther north than the current wall. The current wall was built during the Ming Dynasty.
History[change | change source]
The First Emperor of China started the Qin Dynasty. The Xiongnutribes in the north of China were his enemies. The land in some parts of China is easy to cross, so Qin Shi Huang started building the Great Wall to make it more difficult for the Xiongnu to invade China.
Other dynasties in China worked more on the wall and made it longer. The Han, Sui, Northern and Jin Dynasties all repaired, rebuilt or expanded the Great Wall. During the Ming Dynasty, major rebuilding work took place. Sections of the wall were built with bricks and stone instead of earth.
Construction and rebuilding of the Great Wall[change | change source]
Builders used materials that were nearby. Some parts of the wall were made of mud, straw, and twigs. Thousands of workers died from giant falling stones, exhaustion, disease, animal attacks, and starvation. The workers who died were buried in and under the Great Wall is a myth.
Visibility from space[change | change source]
Rumours about astronauts being able to see the Great Wall from the moon are scientifically not proven. The Great Wall has shown up in radar images taken from space, but scientists are sure it is not possible for astronauts to see the wall with a naked eye.One astronaut who spoke about the visibility of the Great Wall from space was Neil Armstrong. He said that on the moon it was very clear that the wall was not visible. However, astronaut William Pogue was able to see the wall from a Low Earth Orbit distance (300-530 km height), but only with binoculars and with lots of practice. 
References[change | change source]
Other websites[change | change source]
Media related to Great Wall of China at Wikimedia Commons
The Great Wall of China Essay
2903 Words12 Pages
The Great Wall of China
To the northwest and north of Beijing, a huge, serrated wall zigzags it's way to the east and west along the undulating mountains. This is the Great Wall, which is said to be visible from the moon. This massive wall has not only been one of the Ancient Seven Wonders of the World, but it has also been inspiration for many artists, and writers. The building of the Great Wall is one of the biggest tragedies, but through this tragedy arose triumph with the wall, being so much to so many people. The Great Wall of China is much more than a wall, and was built for many reasons that are hidden to most.
Construction of the Great Wall started in the 7th century B.C. The wall states that under the Zhou Dynasty in the…show more content…
Of elephants, lions, birds, flower and heavenly kings as well as charms in six languages-Sanskrit, Tibetan, Phats pa (Mongolian), Uygur, West Xia and Han. (Karls)
The Mutianyu section of the Great Wall, 70 kilometers northeast of Beijing, is linked to the Gubeikou section on the east and the Badaling section on the west. The Mutianyu section of the Great Wall is crenellated for watching and shooting at the invading enemy. Some of the battle forts on the wall are as close as 50 meters apart. It is one of the best sections of the Great Wall. (Karls)
Located in Miyun County northeast of Beijing, the Jinshanling division of the Great Wall, like the Simatai division, belongs to the Gubeikou section of the colossal defence barrier. The battlements in the Jinshanling division of the Great Wall are built along the ridge of a mountain, where the soldiers can resist the invading enemy by taking advantage of the high terrain. (Karls)
Located to the east of Jinshanling, the Simatai division of the Great Wall is 3,000 meters long and has 35 battle forts. The wall rises and falls with the precipitous mountain ridge, while the battle forts are located high up the hills.
From the Beakon Tower alarm was raised by means of smoke signals, at night by fire. Smoke was produced by burning a mixture of wolf dung, sulfur and saltpeter. Shots were fired at the same time. Thus an alarm could be relayed over 500km within just a few hours.