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• methane — /meth ayn/; Brit. /mee thayn/, n. Chem. a colorless, odorless, flammable gas, CH4, the main constituent of marsh gas and the firedamp of coal mines, obtained commercially from natural gas: the first member of the methane, or alkane, series of… …   Universalium

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• Blackdamp — (also known as stythe or choke damp) is an asphyxiant, reducing the available oxygen content of air to a level incapable of sustaining human or animal life. It is not a single gas but a mixture of unbreathable gasses left after oxygen is removed… …   Wikipedia

• technology, history of — Introduction       the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …   Universalium

• Minden Coalfield — This spoil tip (the Schwarzer Hucken i.e. the Black Back ) in Bölhorst, for a long time recalled mining in the area The Minden Coalfield (German: Mindener Revier) is located in the norther Wiehen foothills near the German town of Minden. Here,… …   Wikipedia