drilling bit performance
61rock — rock1 rockless, adj. rocklike, adj. /rok/, n. 1. a large mass of stone forming a hill, cliff, promontory, or the like. 2. Geol. a. mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable… …
62Rock — /rok/, n. a male given name. * * * I In geology, a naturally occurring and coherent aggregate of minerals. The three major classes of rock igneous, sedimentary, and metamorphic are based on the processes that formed them. These three classes are… …
63Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
64Avatar (film, 2009) — Pour les articles homonymes, voir Avatar. Avatar …
65steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …
66Graphite — For other uses, see Graphite (disambiguation). Graphite Graphite specimen General Category Native element mineral …
67Fort Worth, Texas — Fort Worth   City   City of Fort Worth Montage of Fort Worth …
68Peak uranium — is the point in time that the maximum global uranium production rate is reached. After that peak, the rate of production enters a terminal decline. While Uranium is used in nuclear weapons, its primary use is for energy generation via nuclear… …
69Political positions of Herman Cain — Cain in Washington, DC on October 7, 2011 Herman Cain is a businessman and radio talk show host who is running for the Republican presidential nomination in 2012. As of October 25, 2011, polls showed him as the front runner in the Republican… …
70Australian Cattle Dog — Infobox Dogbreed image caption = A red Australian Cattle Dog, or Red Heeler name = Australian Cattle Dog altname = Australian Heeler Blue Heeler (Blue dogs only) Red Heeler (Red dogs only) Queensland Heeler country = AUS fcigroup = 1 fcisection …
