https://padlet.com/3100441/9v6dksw8ovcw Made with whimsy en-us 2018-01-23 19:14:38 UTC 2025-11-13 23:28:59 UTC hello@padlet.com 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223968858 The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.]]> 2018-01-23 19:20:45 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223968858 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223979373 In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock that were formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.]]> 2018-01-23 19:38:57 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223979373 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223980836 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 19:41:31 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223980836 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223981403 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-23 19:42:37 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223981403 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223982217 the time taken for the radioactivity of a specified isotope to fall to half its original value.]]> 2018-01-23 19:44:12 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223982217 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223982820 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-23 19:45:21 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223982820 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223984219 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.]]> 2018-01-23 19:47:58 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223984219 3100441 https://padlet.com/3100441/9v6dksw8ovcw/wish/223985314 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 19:49:55 UTC https://padlet.com/3100441/9v6dksw8ovcw/wish/223985314