radiometric temperature

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• Radiometric dating — (often called radioactive dating) is a technique used to date materials such as rocks, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.[1]… …   Wikipedia

• Closure temperature — This article is about radiometric dating. For blocking temperature in a ferromagnet, see Superparamagnetism. In radiometric dating, closure temperature or blocking temperature refers to the temperature of a system, such as a mineral, at the time… …   Wikipedia

• Blocking temperature — The temperature below which isotopes in a mineral are no longer free to move, at which point the radiometric clock starts. External links* [http://www.wwnorton.com/college/geo/earth2/glossary/b.htm Glossary] , Earth: a Portrait of a Planet. W. W …   Wikipedia

• Mariner 2 — Operator NASA Major contractors Jet Propulsion Laboratory Mission type Flyby …   Wikipedia

• radiometer — radiometric /ray dee oh me trik/, adj. radiometry, n. /ray dee om i teuhr/, n. 1. Also called Crookes radiometer. an instrument for demonstrating the transformation of radiant energy into mechanical work, consisting of an exhausted glass vessel… …   Universalium

• geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …   Universalium

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• Thermometer — A clinical mercury in glass thermometer …   Wikipedia

• quaternary — /kwot euhr ner ee, kweuh terr neuh ree/, adj., n., pl. quaternaries. adj. 1. consisting of four. 2. arranged in fours. 3. (cap.) Geol. noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era,… …   Universalium

• geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …   Universalium