https://padlet.com/3045141/rhiwqg0jh7u5 Made with ♥ en-us 2018-01-23 19:30:12 UTC 2018-01-23 19:41:16 UTC hello@padlet.com 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975146 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]]> 2018-01-23 19:31:52 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975146 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975446 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 19:32:26 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975446 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975591 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 19:32:43 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975591 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975631 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-23 19:32:48 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975631 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975708 the time taken for the radioactivity of a specified isotope to fall to half its original value.

• the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.

]]> 2018-01-23 19:32:53 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975708 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975849 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-23 19:33:07 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975849 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975977 nother term for carbon dating.]]> 2018-01-23 19:33:21 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223975977 3045141 https://padlet.com/3045141/rhiwqg0jh7u5/wish/223976102 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 19:33:32 UTC https://padlet.com/3045141/rhiwqg0jh7u5/wish/223976102