https://padlet.com/3038851/lscu0jukdu3z Made with whimsy en-us 2018-01-23 19:15:34 UTC 2026-04-27 10:25:34 UTC hello@padlet.com 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223967413 radioactive decay. (rā'dē-ō-āk'tĭv) The spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles.]]> 2018-01-23 19:18:19 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223967413 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223967592 the determination of the age or date of organic matter from the relative proportions of the carbon isotopes carbon-12 and carbon-14 that it contains. The ratio between them changes as radioactive carbon-14 decays and is not replaced by exchange with the atmosphere.]]> 2018-01-23 19:18:39 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223967592 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223968935 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-23 19:20:50 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223968935 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223969367 the time taken for the radioactivity of a specified isotope to fall to half its original value.]]> 2018-01-23 19:21:30 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223969367 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223969456 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock]]> 2018-01-23 19:21:39 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223969456 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223969577 an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion]]> 2018-01-23 19:21:48 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223969577 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223969810 In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rockthat were formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.]]> 2018-01-23 19:22:13 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223969810 3038851 https://padlet.com/3038851/lscu0jukdu3z/wish/223971550 The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.]]> 2018-01-23 19:25:13 UTC https://padlet.com/3038851/lscu0jukdu3z/wish/223971550