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	Eng ID	Term	Definition
	2081	graduation error	See ERROR OF GRADUATION.
	2082	gram(me)	A CGS unit of mass equal to one one-thousandth of a KILOGRAMME.
	2083	granite	Light-coloured, acidic IGNEOUS ROCK mineralogically composed primarily of QUARTZ and potassium-sodium rich feldspars in which the mineral ... more Light-coloured, acidic IGNEOUS ROCK mineralogically composed primarily of QUARTZ and potassium-sodium rich feldspars in which the mineral grains are visible to the naked eye (phaneritic texture).
	2084	graphic control survey	See SURVEY.
	2085	graphic scale	See SCALE: BAR.
	2086	graticule	The network of lines representing MERIDIANS and PARALLELS on a MAP, CHART, or PLOTTING SHEET. See also GRID. A SCALE at the FOCAL PLANE of a... more The network of lines representing MERIDIANS and PARALLELS on a MAP, CHART, or PLOTTING SHEET. See also GRID. A SCALE at the FOCAL PLANE of an optical instrument to aid in the measurement of objects. See also RETICLE.
	2087	graticule adjustment	The transportation or movement of the GRATICULE in order to change the ORIGIN of reference.
	2088	gravel	Loose detrital material ranging in size from 2 to 256 mm.
	2089	gravimeter	A weighing device or instrument of sufficient sensitivity to register variations in the WEIGHT of a constant mass when the mass is moved f... more A weighing device or instrument of sufficient sensitivity to register variations in the WEIGHT of a constant mass when the mass is moved from place to place on the EARTH and thereby subjected to the influence of GRAVITY at those places. Also called gravity meter.
	2090	gravimetric survey	See SURVEY.
	2091	graving dock	See DOCK: DRY.
	2092	gravitation	In general, the mutual attraction between masses of matter (bodies). Gravitation is the component of GRAVITY which acts towards the EARTH.
	2093	gravity	That force which tends to pull bodies towards the EARTH; that is to give bodies WEIGHT. Gravity is the resultant of two opposing forces: GRA... more That force which tends to pull bodies towards the EARTH; that is to give bodies WEIGHT. Gravity is the resultant of two opposing forces: GRAVITATION and CENTRIFUGAL FORCE due to the ROTATION of the EARTH.
	2094	gravity: centre of	A point at which the mass of the entire body may be regarded as being concentrated.
	2095	gravity: direction of	The DIRECTION indicated by a PLUMB LINE. It is perpendicular to the surface of the GEOID. Also called direction of the force of gravity.
	2096	gravity: intensity of	The magnitude with which GRAVITY acts, expressed in suitable units, usually as an ACCELERATION, in GALS; as a force, in DYNES.
	2097	gravity anomaly	The difference between the observed gravity value properly reduced to SEA LEVEL and the theoretical GRAVITY obtained from gravity formula. S... more The difference between the observed gravity value properly reduced to SEA LEVEL and the theoretical GRAVITY obtained from gravity formula. See BOUGUER ANOMALY, FREE-AIR ANOMALY, ISOSTATIC ANOMALY.
	2098	gravity anomaly chart	See CHART.
	2099	gravity coring	A method to obtain cores by bottom penetration solely as a result of gravity.
	2100	gravity meter	See GRAVIMETER.
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