https://padlet.com/304935/vjpleh2bkg9j period:1 en-us 2018-01-22 16:20:37 UTC 2025-11-19 00:25:07 UTC hello@padlet.com 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223410809 The geologic time scale is a system of chronological dating that relates geological strata to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history]]> 2018-01-22 16:22:47 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223410809 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223412582 n 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.]]> 2018-01-22 16:25:32 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223412582 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223415021 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.]]> 2018-01-22 16:29:36 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223415021 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223415758 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-22 16:30:56 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223415758 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223417633  Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past. The age of the Earth is approximately one-third of the age of the ]]> 2018-01-22 16:33:49 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223417633 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223419013 the time taken for the radioactivity of a specified isotope to fall to half its original value.]]> 2018-01-22 16:35:55 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223419013 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223420367 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-22 16:38:11 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223420367 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223422226 radiocarbon dating. noun. 1. a technique for determining the age of organic materials, such as wood, based on their content of the radioisotope 14C acquired from the atmosphere when they formed part of a living plant. The 14C decays to the nitrogen isotope 14N with a half-life of 5730 years.]]> 2018-01-22 16:41:07 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223422226 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223423428 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.]]> 2018-01-22 16:43:07 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223423428 304935 https://padlet.com/304935/vjpleh2bkg9j/wish/223424192 This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.]]> 2018-01-22 16:44:26 UTC https://padlet.com/304935/vjpleh2bkg9j/wish/223424192