geo-, ge- +

A system of measuring the history of the earth by studying the rocks of the earth's crust.

Since new rocks are generally deposited on top of existing material, those lower down are oldest.

The strata of rock are classified according to their age, and a time scale corresponding to this can be constructed.

The main divisions (eras) are the Paleozoid, Mesozoic, and Cenozoic. These are further subdivided into periods and epochs.

The relative degree of certainty with which the existence, abundance, and quantity of a given resource can be ascertained; such as, coal or oil.

An extensive region that is characterized by a similar geologic history, or by particular structural or physiographical features throughout; for example, a basin or delta.

The long-term accumulation of a substance; such as, carbon dioxide or radioactive waste, in a natural geologic formation; for example, a sedimentary basin, seabed, or underground cavern.

Although the idea of intentionally storing carbon dioxide underground for extended periods is relatively new, nature has in fact been doing it for millions of years.

There are numerous natural carbon dioxide reservoirs throughout the Rocky Mountain states of the U.S. in geologic “domes” and “traps”, suggesting these formations will be excellent for storing carbon dioxide captured from industrial facilities.

The overall capacity of these natural reservoirs, however, is far less than the storage capacity needed if industrial carbon dioxide capture is to be practiced on any significant scale.

A major demonstration of carbon dioxide injection into a saline formation for sequestration is under way at an offshore gas platform in the North Sea near Norway. Results from this project (and others) suggest that such formations will be reliable, long-term, geologic sequestration (storage) sites or carbon dioxide reservoirs.

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.
2. Having properties, or characteristics, of geomagnetism.

Relating to terrestrial magnetism.

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

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.

A world-wide disruption of the earth's magnetic field, distinct from regular diurnal variations; caused by ionic disturbances from solar events.

1. The various magnetic phenomena that are generated by the earth and its atmosphere; and by extension, the magnetic phenomena in interplanetary space.
2. The magnetism of the earth.
3. The study of the earth's magnetism.

The various magnetic phenomena that are generated by the earth and its atmosphere, and by extension the magnetic phenomena in interplanetary space.

1. Divination by the analysis of figures or lines drawn in dirt (or on paper).
2. A system of divination by scattering pebbles, dust, sand grains, or seed on the ground and interpreting their shapes and positions.
3. Making marks on the ground with a stick (now with a pencil or pen on paper).

Still used by modern-day Chinese in Hong Kong and other places before construction of a building takes place.