geo-, ge- +

A reference to the chronology, or time sequences, of the Earth's history as determined by geological events: The world's geochronological past makes it possible for people to understand more clearly how the world unfolded or developed over time.

Someone who studies the chronology, or time periods, of the Earth, as based on both absolute and relative methods of age determination: Jeff's mother was a geochronologist who studied and ascertained the ages of rocks, fossils, and sediments by scrutinizing the clues that were inherent in the samples themselves.

The chronology of the Earth, or the measurement of geological time and the ordering of past geological events: Geochronology is the time sequence of the Earth’s history as governed by geological events.

Geochronology involves the research of dating and the study of time in relation to the Earth's history as revealed by geological data.

A reference to the measurement of an interval of time in relation to the history of the Earth and by using absolute or relative dating techniques: Geochronometric research involves the assessments of geologic time by scrutinizing isotopic radioactive decay.

An extension of geometry conceived as taking time into account as the fourth dimension; the geometry of space-time: Geochronometry uses faultless calculations of geologic time, as through isotopic-radioactive decay or radioactive elements or minerals.

A part of the Earth's crust which is subjected to downward warping during a large span of geological time: A geocline is a usually elongated, basinlike depression along the edge of a continent in which a thick sequence of sediments and volcanic deposits have accumulated.

The practice or process of matching standardized tabular data (organized as a table or list) to a specific real world location with established geographical coordinates: Geocoding assigns geographic identifiers (for example, codes or geographic coordinates expressed as latitude-longitude) to map features and other data records, such as street addresses.

Media can also be geocoded, for example where a picture was taken, IP addresses (Internet Protocol address or a numerical label), and anything that has a geographic component.

With geographic coordinates, the features can be mapped and entered into Geographic Information Systems.

A form of life that passes a part of its existence in the soil: Some mammals, reptiles, and amphibians are geocoles spend a portion of their lives in the ground..

To spend part of an organism's life in the soil, like an egg, or larval, stage in the ground: Flies, beetles, or moths are examples of creatures that geocole.

Referring to life in the soil for part of a life cycle or period of time: Some smaller forms of life, like mites and earthworms, and some larger animals, such as burrowing rodents, are all considered to be geocolous organisms.

1. The outer covering of the Earth's atmosphere (no pl): The geocorona is the outermost region of the Earth's atmosphere, reaching to a height approximately 15 times the radius of the Earth and consisting mainly of hydrogen.
2. An envelope of ionized gases, mainly hydrogen, which encircles the Earth to about 15 Earth radii: The geocorona emits Lyman-alpha radiation in the presence of sunlight which refers to a radiation emitted by hydrogen associated with the spectral line in the Lyman series (group of lines in the ultraviolet spectrum of hydrogen) whose wavelength is 121.5 nanometers.

In geology, the study of the origin of the Earth: Adam was fascinated by the creation of the globe and wanted to know more about this process, so he tried to find as much information about geocosmogony as possible.

The study of the geological origin and history of the Earth: At the university, Dr. Timmons was invited to a conference on geocosmology, a branch of historical geology of the world.

A reference to land-movements that reduce the area of the Earth's surface covered by water: Geocratic action occurs when land expands or continents enlarge, and oceanic areas decrease in size.

1. A lead-gray or grayish blue mineral with a metallic luster: A geocronite consists of sulphur, antimony, and lead, with a small proportion of arsenic.
2. A white or greenish-white, opaque, metallic, monoclinic mineral: Geocronites usually occur in massive, granular form, and have a specific gravity of 6.4 and a hardness of 2.5 on the Mohs scale.

A scale for classifying minerals based on relative hardness, is determined by the ability of harder minerals to scratch softer ones.

The scale includes the following minerals listed in order from the softest to the hardest: