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period |
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period, in geologic timeperiod, unit of time on the geologic timescale geologic timescale, a chronological scale of earth's history used to measure the relative or absolute age of any part of geologic time. Of the numerous timescales, the most common is based on geologic time units, which divide time into eras, periods, and epochs...... Click the link for more information. . Periods are shorter than an era and longer than an epoch. Periods are of variable length, generally lasting tens of millions of years, with characteristic fossils found preserved in the sediments deposited during the period. It is also used to designate a characteristic of geologic time, such as the glacial period. period, in grammarperiod: see punctuation punctuation [Lat.,=point], the use of special signs in writing to clarify how words are used; the term also refers to the signs themselves. In every language, besides the sounds of the words that are strung together there are other features, such as tone, accent, and..... Click the link for more information. . period, in physicsperiod, in physics: see harmonic motion harmonic motion, regular vibration in which the acceleration of the vibrating object is directly proportional to the displacement of the object from its equilibrium position but oppositely directed...... Click the link for more information. ; wave wave, in physics, the transfer of energy by the regular vibration , or oscillatory motion, either of some material medium or by the variation in magnitude of the field vectors of an electromagnetic field (see electromagnetic radiation ). ..... Click the link for more information. . periodIn geology, the basic unit of the geologic time scale. During these spans of time, specific systems of rocks were formed. Originally, the method for defining the sequence of periods was relative; it was based on stratigraphy and paleontology. Carbon-14 dating and similar methods are now used to determine absolute ages for various periods. |
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 PABX PAC Paca, William PACBASE PACE pacemaker  pacemaker refractory periodpacemaker, artificial Pach, Walter Pachacamac Pacheco, Francisco Pachelbel, Johann Pacher, Michael Pachmann, Vladimir de  |
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