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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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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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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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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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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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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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Geothermal Energy
Geothermal Energy
The word "geothermal" is derived from the Greek words geo (earth) and therme (heat), and "energy" is defined as usable power, such as heat or electricity. The temperature at the Earth's core (6,437 kilometers or 4,000 miles deep) may exceed 4,980°C (9,000°F). Energy from...
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machine tool
machine tool power-operated tool used for finishing or shaping metal parts, especially parts of other machines. An establishment that is equipped with such tools and specializes in such work is known as a machine shop. Machine tools operate by removing material from the workpiece, much as a sculpto...
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oceanography
oceanography study of the seas and oceans. The major divisions of oceanography include the geological study of the ocean floor (see plate tectonics ) and features; physical oceanography, which is concerned with the physical attributes of the ocean water, such as currents and temperature; chemical ...
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