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gas, inert: a gas that does not react with materials with which it is in contact, e.g., nitrogen.
(gas inerte)
gasification: an advanced thermal treatment process that converts carbonaceous materials through a process involving partial oxidation of the feedstock in a reducing atmosphere in the presence of steam at temperatures sufficient to convert the feedstock to synthesis gas; to convert inorganic matter in the feedstock (when the feedstock is a solid or semi-solid) to a glassy solid material known as vitreous frit or slag; and to convert halogens into the corresponding acid halides.
(gasificación)
gradient: the degree of inclination, or the rate of ascent or descent, in a highway, road, river, etc.
(gradiente)
greenhouse effect: A natural system of trapping the Earth's heat. Solar rays which penetrate the atmosphere to reach the Earth's surface are then partly re-radiated by this suface. Certain gases present in the atmosphere absorb these ascending rays and reflect them back to the surface as heat, which allows the Earth to be at a temperature of 15°C. Human activity contributes to the increase in content of these gases (carbon dioxide CO2, methane CH4 and chlorofluorocarbons CFCs) in the atmosphere, which in turn, raises the Earth's temperature.
(efecto invernadero)
groundwater: water that infiltrates into the earth and is stored in usable amounts in the soil and rock below the earth's surface; water within the zone of saturation.
(agua freática/subterránea)
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