hulla bituminosa
| 19:53 Sep 10, 2001 |
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| 5 | bituminous coal |
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| 5 | Bituminous (soft coal) |
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Answers
15 mins confidence: 
bituminous coal Explanation: Ref: Diccionario para Ingenieros by Louis Robb. |
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1 day 2 hrs confidence:
Bituminous (soft coal) Explanation: Hola Antonio: Te mando el contexto donde encontré tu duda. ...Coal has either a dull or shiny luster and is divided into three main grades: anthracite (hard coal),"bituminous (soft coal)", and lignite... Geologists estimate that it took about 10 feet of leaves, tree trunks, and other organic matter to produce a one-foot layer of coal. The first stage in the transformation of decaying plant material into coal is the development of peat. Following long intervals of time, peat is transformed into lignite (brown coal) and eventually into bituminous coal. Had Kansas coal undergone even more heat and pressure, it might have become anthracite. Espero te ayude, Saludos, Andrea Reference: http://www.kgs.ukans.edu/Extension/geotopics/coal.html |
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