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drill
drill tool used to create a hole, usually in some hard substance, by its rotary or hammering action. Many different tools make up the drill family. The awl is a pointed instrument used for piercing small holes. In its early form it was a thorn or a tool of bone or chipped flint; many prehistoric aw...
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well
well aperture in the earth's surface through which substances in a natural underground reservoir, such as water, gas, oil, salt, and sulfur, can flow or be pumped to the surface. In the United States, until some years after the Civil War, the majority of wells were "open," i.e., holes dug in th...
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John Henry
John Henry legendary African American famous for his strength, celebrated in ballads and tales. In the most popular version of the story, John Henry tries to outwork a steam drill with only his hammer and steel bit. Although he succeeds in beating the machine, he dies of the strain. His legend orig...
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exercise
exercise n. 1. (often exercises) a military drill or training maneuver. 2. (exercises) ceremonies: graduation exercises....
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Deep Sea Drilling Project
Deep Sea Drilling Project U.S. program designed to investigate the evolution of ocean basins by core drilling of ocean sediments and underlying oceanic crust. Funded by the National Science Foundation, the project was directed by the Joint Oceanographic Institution for Deep Earth Sampling (JOIDES),...
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New Iberia
New Iberia city (1990 pop. 31,828), seat of Iberia parish, S La., on Bayou Teche, which is connected to the Intracoastal Waterway by a canal; inc. 1836. It has printing and publishing, and its manufactures include oil- and gas-drilling equipment, fabricated steel, food products, hunting equipment...
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Project Mohole
Project Mohole program proposed in 1957 to drill a hole down to the boundary between the crust and the mantle , known as the Mohorovičić discontinuity at about 4 to 43 mi (7 to 70 km) below the earth's surface. Initiated by the American Miscellaneous Society, a loose organization of scie...
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fertilizer
fertilizer organic or inorganic material containing one or more of the nutrients—mainly nitrogen, phosphorus, and potassium, and other essential elements required for plant growth. Added to the soil or other medium, fertilizers provide plant nutrients that are naturally lacking or that have b...
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Jethro Tull
Jethro Tull 1674-1741, English agriculturist and inventor. He studied methods of agriculture in England, France, and Italy and influenced British agriculture through his writings, which include The Horse-Hoeing Husbandry (1733). Tull advocated the use of manures, pulverizing the soil, planting wi...
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barite
barite , barytes [New Lat., from barium], or heavy spar, a white, yellow, blue, red, or colorless mineral. It is a sulfate of barium, BaSO 4 , found in nature as tabular crystals or in granular or massive form and has a high specific gravity. The mineral is widely distributed throughout the ...
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