https://padlet.com/3104111/nlerb5c4bmpz Made with serendipity en-us 2018-01-23 17:31:42 UTC 2018-01-23 17:55:43 UTC hello@padlet.com 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223902416 The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) 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.]]> 2018-01-23 17:34:55 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223902416 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223903346 Strata are layers of rock, or sometimes soil. In nature,strata come in many layers. It is a term in sedimentary and historical geology; the singular isstratum. ... These layers are laid down as sediment, often in the sea, and are slowly changed by pressure, heat and chemical action into rocks.]]> 2018-01-23 17:36:25 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223903346 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223903598 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 17:36:51 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223903598 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223903893 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 17:37:22 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223903893 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223904236 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-23 17:37:55 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223904236 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223904738 the determination of the age of objects of organic origin bymeasurement of the radioactivity of their carbon content.]]> 2018-01-23 17:38:32 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223904738 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223905478 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 17:39:52 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223905478 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223914719 2018-01-23 17:55:22 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223914719 3104111 https://padlet.com/3104111/nlerb5c4bmpz/wish/223914755 2018-01-23 17:55:26 UTC https://padlet.com/3104111/nlerb5c4bmpz/wish/223914755