underground process
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Underground coal gasification — (UCG) is an in situ gasification process carried out in non mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas. The process is flexible in operation and is… … Wikipedia
Underground mining (soft rock) — refers to a group of underground mining techniques used to extract coal, oil shale and other minerals or geological materials from sedimentary ( soft ) rocks. Because deposits in sedimentary rocks are commonly layered and relatively less hard,… … Wikipedia
Underground — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Underground », sur le Wiktionnaire (dictionnaire universel) Underground est un mot anglais signifiant… … Wikipédia en Français
Underground (documentary film) — Infobox Film name = Underground |thumb image size = 200px caption = imdb id = 0075367 writer = starring = Bill Ayers Kathy Boudin Emile de Antonio Bernadine Dohrn Jeff Jones Mary Lampson Haskell Wexler Kathy Wilkerson directors = Emile de Antonio … Wikipedia
Underground City (Beijing) — Entrance of the Underground City at Xidamochang Jie The Underground City (Chinese: 地下城; pinyin: Dìxià Chéng), also known as Dixia Cheng, is a bomb shelter comprising a network of tunnels located beneath Beijing, China, wh … Wikipedia
Underground Hades Empire Infershia — The Underground Hades Empire Infershia (地底冥府インフェルシア, Chitei Meifu Inferushia?) are a fictional group of antagonists in the Japanese Super Sentai series Mahou Sentai Magiranger. They are from the Kedomono Realm at the center of the Earth, which… … Wikipedia
Underground (film) — Infobox Film name = Подземље Podzemlje Underground imdb id = 0114787 writer = Dušan Kovačević Emir Kusturica starring = Miki Manojlović Lazar Ristovski Mirjana Joković Slavko Štimac director = Emir Kusturica producer = Pierre Spengler Karl… … Wikipedia
London Underground — Infobox Public transit name = London Underground The Tube |thumb|Official logo. imagesize= 150px locale = Greater London, Chiltern, Epping Forest, Three Rivers and Watford transit type = Rapid transit began operation = 1863 system length = 400 km … Wikipedia
tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
The Velvet Underground — This article is about the band. For their self titled album, see The Velvet Underground (album); for the book, see The Velvet Underground (book) Infobox musical artist Name = The Velvet Underground Img capt = With Nico in 1966, from left to right … Wikipedia
History of the London Underground — The history of the London Underground is one of gradual evolution. One section of it was the first urban underground passenger carrying railway in the world, for although the Atlantic Avenue Tunnel in New York, opened in 1844, is sometimes called … Wikipedia
