k-ar age dating
81fis|sion-track dating — «FIHSH uhn TRAK», a method of determining age of rocks and other geological formations by counting the characteristic tracks left by spontaneous fission of uranium 238 during the lifetime of each sample. The number of tracks is proportional to… …
82carbon-14 dating — noun a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon 14; believed to be reliable up to 40,000 years • Syn: ↑radiocarbon dating, ↑carbon dating • Hypernyms: ↑dating, ↑geological… …
83potassium-argon dating — noun geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon • Hypernyms: ↑dating, ↑geological dating * * * /peuh tas ee euhm ahr gon/, Geol. a method for estimating the age of a… …
84Astrological age — For the song, see Aquarius/Let the Sunshine In. For the album, see The Age of Aquarius (album). An astrological age is a time period in astrology which is believed by some to parallel major changes in the Earth s inhabitants development,… …
85Global Standard Stratigraphic Age — In the Stratigraphy sub discipline of Geology, a Global Standard Stratigraphic Age, officially abbreviated GSSA, is a chronological reference point and criteria in the world s rock records used to define the boundaries (a internationally… …
86Atomic Age — This article is about the historical era. For the comic book miniseries, see Atomic Age (comics). An early nuclear power plant that used atomic energy to generate electricity. The Atomic Age, also known as the Atomic Era, is a phrase typically… …
87Gestational age — This article is about gestational age in humans. For information on gestational age in non human animals, see gestation. Birth weight and gestational age Classifications Large for gestational age: Wei …
88Ice age — An ice age is a period of long term reduction in the temperature of the Earth s surface and atmosphere, resulting in an expansion of continental ice sheets, polar ice sheets and alpine glaciers. Glaciologically, ice age is often used to mean a… …
89British Iron Age — In Britain and Ireland the Iron Age lasted from about the 7th century BC until the Roman conquest and until the 5th century in non Romanised parts such as Scotland and Ireland. This period is also called the era of Celtic Britain cite web… …
90Bronze Age sword — Bronze Age swords appear from around the 17th century BC, evolving out of the dagger. Early examples with typical leaf shaped blades are found in Mesopotamia, around the Mediterranean, particularly in Crete, and around the Black… …
