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fermentation: chemical reactions accompanied by living microbes that are supplied with nutrients and other critical conditions such as heat, pressure and light.
(fermentación)
fertilizer: any one of a large number of natural and synthetic materials, including manure and nitrogen, phosphorus, and potassium compounds, spread or worked into the soil to increase its fertility.
(fertilizante)
filtration: the process of passing a liquid or gas through a porous article or mass (paper, membrane, sand, etc.) to separate out matter in suspension.
(filtración)
fly ash: residues from domestic waste inicneration fume cleansing.
(ceniza)
fossil fuel: a hydrocarbon fuel, such as petroleum, derived from living matter of a previous geologic time.
(combustible fósil)
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