geo-, ge- +

(Greek: earth, land, soil; world; Gaia (Greek), Gaea (Latin), "earth goddess")

geocentric coordinate system
1. In astronomy, a system of celestial coordinates located with respect to the center of the earth.
2. In cartography, a set of map coordinates which define the position of a point with respect to the center of the earth.
geocentric horizon
In cartography, or maps, the plane through the center of the earth, parallel to the topocentric (a point on the surface of the earth) horizon.
geocentric latitude (s) (noun), geocentric latitudes (pl)
1. In astronomy, the angular distance in degrees which a celestial object lies north or south of the earth's equator.
2. In geodesy, the angle formed with the major axis of the ellipse (stretched circle with slightly longer, flatter sides) by the radius vector (magnitude and a direction) from the center of the ellipse to the given point.
geocentric longitude (s) (noun), geocentric longitudes (pl)
The angular distance in degrees that a celestial object lies east or west of Greenwich Meridian; or the meridian passing through Greenwich (Greater London borough on the Thames in England) which was internationally adopted as the earth's zero of longitude in 1884.
geocentric parallax, diurnal parallax
The change in an astronomical object's apparent position caused by the change in the observer's earthly position because of the motion of the earth during the day.
geocentric theory
In history, the ancient belief that the sun and other bodies of the solar system revolve around the earth; stated in detail by Ptolemy about 140 A.D. and later replaced by the heliocentric theory of Copernicus.
geocentric zenith
1. The point where a line from the center of the earth through a point on its surface meets the celestial sphere.
2. The point at which a line from the center of the earth through a point on its surface meets the celestial sphere.
1. The belief that the earth is the center of the universe.
2. The belief that the sun revolves around the earth. This was all the rage in Galileo's day.
3. Within the environmental movement, a concern over the state and future of the earth.
In mineralogy, a white, flaky, wax-like hydrocarbon or any of numerous organic compounds which contain only carbon and hydrogen that exist in brown coal.
1. A reference to the study of the chemical composition of the various phases of the earth and the physical and chemical processes which have produced the observed distribution of the elements and nuclides in these phases.
2. Descriptive of the scientific study of the chemistry of the earth, including the rocks, sediments, and soil that constitute the solid earth and the fluids which compose the ocean, inland waters, and the atmosphere.
geochemical anomaly
An unusually high concentration of one or more chemical elements in a sample of rock, soil, vegetation, water, or a high concentration of hydrocarbons in soil, which often indicates a nearby mineral deposit.
geochemical balance
1. The study of the global distribution and the migration of a particular element, mineral, or compound, including the amount liberated by weathering and transported to earth sediments and oceans.
2. The proportional distribution, and the migration rate, in the global fractionation of elements, minerals, or compounds; for example, the distribution of quartz in igneous rocks, its liberation by weathering, and its redistribution into sediments and, in solution, into lakes, rivers, and oceans.

Sediments refer to solid fragments of inorganic or organic material that come from the weathering (disintegration and decomposition) of rock and are carried and deposited by wind, water, or ice.

geochemical cycle (s) (noun), geochemical cycles (pl)
The successive stages in the circulation and migration of chemical elements among the lithosphere, hydrosphere, and atmosphere during geological changes.
geochemical evolution
1. Over geological time, any change in the chemical composition of some section of the earth; such as, the oceans.
2. Any alteration or change in the chemical composition of a rock in which the amount of a particular component exceeds the amount present in the parent rock.
1. A science that deals with the chemical composition of and chemical changes in the solid matter of the earth or a celestial body (as the moon).
2. The related chemical and geological properties of a substance.

Available for further enlightenment: the Earth, Words from the Myths.

Cross references of word families related directly, or indirectly, to: "land, ground, fields, soil, dirt, mud, clay, earth (world)": agra-; agrest-; agri-; agro-; argill-; choro-; chthon-; epeiro-; glob-; lut-; myso-; pedo-; pel-; rhyp-; soil-; sord-; terr-.