Occurrence of Attributes in Original Text

The text related to the cultural heritage 'The Great Wall' has mentioned 'Earth' in the following places:
Occurrence Sentence Text Source
Contents 1 Names 2 History 2.1 Early walls 2.2 Ming era 2.3 Foreign accounts 3 Course 3.1 Han Great Wall 3.2 Ming Great Wall 4 Characteristics 5 Condition 6 Visibility from space 6.1 From the Moon 6.2 From low Earth orbit 7 Gallery 8 See also 9 Notes 10 References 11 Further reading 12 External links
[7] The Chinese character xe5x9fx8e, meaning city or fortress, is a phono-semantic compound of the "earth" radical xe5x9cx9f and phonetic xe6x88x90, whose Old Chinese pronunciation has been reconstructed as *dexc5x8b.
[14] Poetic and informal names for the wall included "the Purple Frontier" (xe7xb4xabxe5xa1x9e, Zxc7x90sxc3xa0i)[17] and "the Earth Dragon" (t xe5x9cx9fxe9xbex8d, s xe5x9cx9fxe9xbex99, Txc7x94lxc3xb3ng).
Built to withstand the attack of small arms such as swords and spears, these walls were made mostly of stone or by stamping earth and gravel between board frames.
While stones and tiles were used in some parts of the Liaodong Wall, most of it was in fact simply an earth dike with moats on both sides.
The size and weight of the bricks made them easier to work with than earth and stone, so construction quickened.
From low Earth orbit
A more controversial question is whether the wall is visible from low Earth orbit (an altitude of as little as 160xc2xa0km (100xc2xa0mi)).
Veteran US astronaut Gene Cernan has stated: "At Earth orbit of 100 to 200 miles [160 to 320xc2xa0km] high, the Great Wall of China is, indeed, visible to the naked eye."