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Absolute dating involves determining

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Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.

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gravel, clay, or sand), its provenience (horizontal and vertical position within the matrix), and its association with other artifacts (occurrence together with other archeological remains, usually in the same matrix).The age of the fossil must be determined so it can be compared to other fossil species from the same time period.Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.An atom may share electrons with an adjacent atom or atoms; the result being a molecule.

( Beta decay: The process of radioactive decay in which a neutron loses a beta particle (i.e. This increases the atomic number of the atom by one by turning the neutron into a proton.

The provenience, association, and matrix of such archaeological data SYNONYMS OR RELATED TERMS: ADTCATEGORY: database design DEFINITION: A class of data that does not conform to alphanumeric, numeric, Boolean, text, or string types; includes time and date fields as well as special data types for ordinal time, statistical dates, stratigraphic order, and CATEGORY: branch DEFINITION: The use of geological techniques and methods to archaeological work.

It is different from geoarchaeology in that the latter is a subfield of archaeology focusing on the physical context of deposits.

The assessment of context includes study of what has happened to the find since it was buried in the ground.

CATEGORY: technique; term DEFINITION: A context of an archaeological find that has been disturbed by subsequent human activity or natural phenomena.

: The following is taken from several on-line sources, chiefly Illustrated Glossary of Geologic Terms by Steven M. Richardson (Englewood Cliffs, NJ, Prentice Hall, 1995); definitions conform generally, and in some cases specifically, to definitions given in Robert L Bates and Julia A Jackson (editors), Glossary of Geology, 3rd ed., American Geological Institute, Alexandria, Virginia, 1987.), and Radiometric Dating A Christian Perspective Dr. Wiens Division of Geological & Planetary Sciences California Institute of Technology reprinted from Graham Kendell archives. Elsberry's talk.origins jargon FAQOriginal definitions by yours truly are initialed thus: " Archean: The second oldest eon in Earth history.