https://padlet.com/3033861/29pbiph1zdlc en-us 2018-01-23 17:30:15 UTC 2023-10-14 06:42:07 UTC hello@padlet.com 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900072 The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.]]> 2018-01-23 17:31:20 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900072 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900197 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 17:31:30 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900197 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900295 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 17:31:38 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900295 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900483 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock]]> 2018-01-23 17:31:55 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900483 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900607 the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.]]> 2018-01-23 17:32:06 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900607 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900748 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-23 17:32:18 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900748 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900826 A form of radiometric dating used to determine the age of organic remains in ancient objects, such as archaeologicalspecimens, on the basis of the half-life of carbon-14 and a comparison between the ratio of carbon-12 to carbon-14 ina sample of the remains to the known ratio in living organisms. Also called carbon dating, carbon-14 dating.]]> 2018-01-23 17:32:25 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900826 3033861 https://padlet.com/3033861/29pbiph1zdlc/wish/223900912 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 17:32:34 UTC https://padlet.com/3033861/29pbiph1zdlc/wish/223900912