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natural gas hydrate
natural gas hydrate A type of clathrate in which a naturally occurring gas, mainly methane, is held within a lattice of water ice. Such hydrates form under conditions of pressure and temperature found in the upper 300–2000 m of marine sediments where the water temperature is at or below 0 °C and the pressure is greater than 4 MPa, often beneath permafrost. The hydrates can block gas transmission pipes and disturbing them can cause the release of methane (a greenhouse gas). Should it prove possible to recover the methane they contain, the amount present in sediments, measured as carbon, is estimated to be up to twice that of all other recoverable and nonrecoverable fossil fuels combined.
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AILSA ALLABY and MICHAEL ALLABY. "natural gas hydrate." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "natural gas hydrate." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O13-naturalgashydrate.html AILSA ALLABY and MICHAEL ALLABY. "natural gas hydrate." A Dictionary of Earth Sciences. 1999. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-naturalgashydrate.html |
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clathrate
clathrate A structure in which molecules of one substance (the guest) are physically trapped in cavities within the crystal lattice of another (the host), without specific chemical bonding between them. The noble gases and some hydrocarbons form clathrates with water, occupying cavities in an open ice structure; they are called clathrate hydrates. Cometary nuclei may contain ice in the form of clathrate hydrates.
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"clathrate." A Dictionary of Astronomy. 1997. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. "clathrate." A Dictionary of Astronomy. 1997. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O80-clathrate.html "clathrate." A Dictionary of Astronomy. 1997. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-clathrate.html |
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clathrate
clathrate A compound in which molecules of one substance, commonly a noble gas, are completely enclosed within the crystal structure of another substance. Typical examples are Kr and Xe encapsulated in zeolite structures, or Ar, Kr, and Xe trapped in water ice.
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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "clathrate." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "clathrate." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O13-clathrate.html AILSA ALLABY and MICHAEL ALLABY. "clathrate." A Dictionary of Earth Sciences. 1999. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-clathrate.html |
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