of+lower+quality+or+grade
31petroleum refining — Introduction conversion of crude oil into useful products. History Distillation of kerosene and naphtha The refining of crude petroleum owes its origin to the successful drilling of the first oil well in Titusville, Pa., in 1859. Prior to… …
32Economic growth — GDP real growth rates, 1990–1998 and 1990–2006, in selected countries …
33Body piercing materials — In modern Western body piercing, a wide variety of materials are used. Some cannot be autoclaved, and others are may induce allergic reactions, or harbour bacteria. Certain countries, such as those belonging to the EU, have legal regulations… …
34Diamond clarity — Part of a series on Diamonds Material Material properties Crystallographic defects Formatio …
35Day care — Caring for children At home Parents · Extended family Au pair · Babysitting …
36High-yield debt — In finance, a high yield bond (non investment grade bond, speculative grade bond or junk bond) is a bond that is rated below investment grade at the time of purchase. These bonds have a higher risk of default or other adverse credit events, but… …
37Herbalism — Alternative medical systems Acupuncture · Anthroposophic medicine · Ayurveda · Chiropractic  …
38Agriculture and Food Supplies — ▪ 2007 Introduction Bird flu reached Europe and Africa, and concerns over BSE continued to disrupt trade in beef. An international vault for seeds was under construction on an Arctic island. Stocks of important food fish species were reported… …
39environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
40Jewellery Quarter — infobox UK place country = England latitude= 52.489 longitude= 1.910 official name= Jewellery Quarter map type= West Midlands population = 3,000 approx. population density= area total km2= 1.07 metropolitan borough= City of Birmingham… …
