free groundwater
51RCA — Infobox Defunct Company company name = RCA Corporation company slogan = The most trusted name in electronics. fate = Taken over by General Electric and broken up successor = foundation = 1919 defunct = 1988 location = New York, USA… …
52Water — This article is about general aspects of water. For a detailed discussion of its properties, see Properties of water. For other uses, see Water (disambiguation) …
53Nitrogen cycle — Schematic representation of the flow of nitrogen through the environment. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assimilable by higher …
54Water fluoridation — Fluoridation does not affect the appearance, taste or smell of drinking water.[1] Water fluoridation is the controlled addition of fluoride to a public water supply to reduce tooth decay. Fluoridated water has flu …
55Water resources — A natural wetland Water resources are sources of water that are useful or potentially useful. Uses of water include agricultural, industrial …
56Botswana — Republic of Botswana Lefatshe la Botswana …
57Soil — For other uses, see Soil (disambiguation). A represents soil; B represents laterite, a regolith; C represents saprolite, a less weathered regolith; the bottommost layer represents bedrock …
58Landfill in the UK — See also the Landfill Directive, landfill tax and the Landfill Allowance Trading Scheme Landfill in the UK is currently recognised as the Best practicable environmental option (BPEO) for the disposal of certain waste types. In order to apply the… …
59Drainage model — may refer to: a surface drainage model or rainfall runoff model      see surface runoff, runoff model (reservoir) , or a software site providing free download of a conceptual rainfall runoff model (RainOff) based on a… …
60china — /chuy neuh/, n. 1. a translucent ceramic material, biscuit fired at a high temperature, its glaze fired at a low temperature. 2. any porcelain ware. 3. plates, cups, saucers, etc., collectively. 4. figurines made of porcelain or ceramic material …
