geo-, ge- +

With respect to geology, or a reference to geology; the scientific study of the origin, history, and structure of the earth.

A scientist who specializes in the study of the origin, composition, history, structure, and processes of the earth.

One geologist claimed that geologists go to rock'n'roll concerts for entertainment and when they relax, they do it in a rocking chair; but their favorite kind of transportation is a rocket.

To study geology in general, or to specialize in the geology of a specific place.

1. The study of the earth in terms of its development as a planet since its origin, including the history of its life forms, the materials of which it is made, the processes that affect these materials, and the products that are formed from them.
2. The science which includes the structure and mineral constitution of the globe; structural geology.
3. The study or science of the earth, its history, and its life as recorded in the rocks; includes the study of geologic features of an area; such as, the geometry of rock formations, weathering and erosion, and sedimentation.

1. Relating to geomagnetism or the magnetic properties of the earth.
2. Having properties, or characteristics, of geomagnetism.

The study of the sources, configurations, and changes in the earth's magnetic field and the study and interpretation of the remaining magnetism in rocks as a result of the earth's magnetic field when the rocks were formed which is known as paleomagnetism.

The minimum energy of a cosmic-ray particle which can reach the top of the atmosphere at a specified or at a particular geomagnetic latitude.

The dipole or a pair of equal and opposite electric charges or magnetic poles that are separated by a short distance which are created by the earth's magnetic field.

An instrument that can be suspended from the side of a moving ship to measure and to calculate the direction and speed of ocean currents while the ship is under way by measuring the voltage produced by the earth's magnetic field in the moving conductive seawater.

The components of the geomagnetic field at the surface of the earth.

1. The imaginary great circle on the earth's surface formed by the intersection of a plane passing through the earth's center perpendicular to the axis connecting the north and south magnetic poles.
2. That terrestrial great circle which is 90° from the geomagnetic poles.

The magnetic field observed in and around the earth.

The intensity of the magnetic field at the earth's surface is approximately 0.32 gauss at the equator and 0.62 gauss at the north pole.

A gauss equivalent to 1 maxwell per square centimeter and a maxwell is equivalent to the flux that produces one abvolt in a one-turn circuit when the flux is reduced to zero at a uniform rate in one second; while a flux is the electric or magnetic field lines of force that traverse a given cross-sectional area.

1. Any interference in radio communications caused by terrestrial magnetism or the earth's magnetic field.
2. Unwanted radio frequencies caused by fluctuations in the geomagnetic field of the earth.

1. Either of two antipodal (opposite) points marking the intersection of the earth's surface with the extended axis of a powerful magnet bar which is assumed to be located at the center of the earth and indicating the source of the actual magnetic field of the earth.
2. One of two regions of the earth with very high magnetic field strength, taken to be the points at which a line, drawn between the poles of a magnetic dipole generating the earth's magnetic field and extending out in both directions, would cross the earth's surface.

The north pole of a magnet; such as, a compass needle, is attracted to the geomagnetic north pole because the earth's north pole is actually a magnetic south pole (and its geomagnetic south pole is a magnetic north pole).

Alternation of the earth's magnetic polarity or a reversal of the polarity of the earth's magnetic field which has occurred in the past as shown by the remanent magnetization found in igneous and sedimentary rocks.

The earth's internal magnetic field reverses, on average, about every 300,000 to 1 million years.

This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years.

The time between reversals is highly variable, sometimes less than 40,000 years and at other times as long as 35 million years and no regularities or period times have been discovered so far.

A long interval of one polarity may be followed by a short interval of an opposite polarity.

The changes in the earth's magnetic field occurring over hundreds of years and caused by internal changes in the earth or a variation of any field or parameter which occurs over hundreds of years.