petroleum nitrogen bases
51technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …
52Combined Bomber Offensive — alias: Allied Bomber offensive [sic] Part of Strategic bombing campaign in Europe …
53Industrial history of the People's Republic of China — Main articles: Economy and economic history of the People s Republic of China. China s industrial sector has shown great progress since 1949, but in the late 1980s it remained undeveloped in many respects. Although the country manufactured… …
54Finland — /fin leuhnd/, n. 1. Finnish, Suomi. a republic in N Europe: formerly a province of the Russian Empire. 5,109,148; 130,119 sq. mi. (337,010 sq. km). Cap.: Helsinki. 2. Gulf of, an arm of the Baltic, S of Finland. * * * Finland Introduction Finland …
55Florida — This article is about the U.S. state of Florida. For other uses, see Florida (disambiguation). State of Florida …
56Soil conservation — is set of management strategies for prevention of soil being eroded from the earth’s surface or becoming chemically altered by overuse, salinization, acidification, or other chemical soil contamination. The principal approaches these strategies… …
57Belgium — /bel jeuhm/, n. a kingdom in W Europe, bordering the North Sea, N of France. 10,203,683; 11,779 sq. mi. (30,508 sq. km). Cap.: Brussels. French, Belgique /bel zheek /; Flemish, België /bel khee euh/. * * * Belgium Introduction Belgium Background …
58Lithuania — <p></p> <p></p> Introduction ::Lithuania <p></p> Background: <p></p> Lithuanian lands were united under MINDAUGAS in 1236; over the next century, through alliances and conquest, Lithuania extended… …
59Electric vehicle — Sustainable energy Renewable energy …
60global warming — an increase in the earth s average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. [1975 80] * * * Potential increase in global average surface temperatures resulting from… …
