oil-base mud
81Dalian — 大连   Sub provincial city   大连市 …
82Derrick — For other uses, see Derrick (disambiguation). Derrick of Ocean Star Offshore Oil Rig Museum, Galveston, Texas A derrick is a lifting device composed of one tower, or guyed mast such as a pole which is hinged freely at the bottom. It is controlled …
83Central African Republic — a republic in central Africa: a member of the French Community. 3,342,051; 238,000 sq. mi. (616,420 sq. km). Cap.: Bangui. Formerly, Central African Empire, Ubangi Shari. * * * Central African Republic Introduction Central African Republic… …
84Mozambique — /moh zam beek , zeuhm /, n. 1. Formerly, Portuguese East Africa. a republic in SE Africa: formerly an overseas province of Portugal; gained independence in 1975. 18,165,476; 297,731 sq. mi. (771,123 sq. km). Cap.: Maputo. 2. a seaport on an… …
85Calendar of 1998 — ▪ 1999 January January 1 At the stroke of the new year, the Russian ruble is worth a thousand times less than before as three zeros are removed from its value; about six new rubles equal one U.S. dollar. Foreign Minister David Levy… …
86Egypt, ancient — Introduction civilization in northeastern Africa dating from the 3rd millennium BC. Its many achievements, preserved in its art and monuments, hold a fascination that continues to grow as archaeological finds expose its secrets. This article… …
87western Africa, history of — Introduction history of the region from the 11th century to the present. A reasonable body of sources for the writing of western African history begins to be available about AD 1000. Three centuries earlier, the Arabs (Arab) had… …
88Sodium hydroxide — Sodium hydroxide …
89Operation Crossroads — Coordinates: 11°36′N 165°30′E / 11.6°N 165.5°E / 11.6; 165.5 …
90Marcellus Formation — Stratigraphic range: Middle Devonian …
