rubidium - strontium dating


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  • Optical dating — is a method of determining how long ago minerals were last exposed to daylight. It is useful to geologists and archaeologists who want to know when such an event occurred. Alternate names sometimes used are optically stimulated luminescence… …   Wikipedia

  • Goa — Infobox Indian Jurisdiction native name=Goa other name=गोंय state name=Goa type=state capital=Panaji latd = 15.493|longd=73.818 largest city=Vasco da Gama abbreviation=IN GA official languages=Konkani↑ legislature type=Unicameral legislature… …   Wikipedia

  • Molem — (Mollem)   town   Coordinates Country India State Goa …   Wikipedia

  • Anmod — in Konkani is a town in Goa at the Goa Karnataka border.Some of the oldest rocks in the Indian subcontinent are found in Anmod on Goa s border with Karnataka. The rocks are classified as Trondjemeitic Gneiss estimated to be 3,600 million years… …   Wikipedia

  • radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …   Universalium

  • Caffeine — This article is about the stimulant drug. For other uses, see Caffeine (disambiguation). Caffeine Systematic (IUPAC) name …   Wikipedia

  • History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …   Wikipedia

  • Potassium — (pronEng|pəˈtæsiəm) is a chemical element. It has the symbol K ( la. kalium, from ar. qalīy), atomic number 19, and atomic mass 39.0983. The name potassium comes from the word potash , as potassium was first isolated from potash. Potassium is a… …   Wikipedia

  • Psychoactive drug — An assortment of psychoactive drugs A psychoactive drug, psychopharmaceutical, or psychotropic is a chemical substance that crosses the blood–brain barrier and acts primarily upon the central nervous system where it affects brain function,… …   Wikipedia

  • atom — /at euhm/, n. 1. Physics. a. the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical… …   Universalium

  • spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …   Universalium

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