https://padlet.com/305149/80rcx25vhi8a en-us 2018-01-22 18:22:58 UTC 2024-12-14 19:06:46 UTC hello@padlet.com 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223479728 The geologic time scale also known as GTS, 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 18:26:00 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223479728 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223480016 In geology and related fields, a stratum 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 18:26:29 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223480016 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223480439 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 18:27:04 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223480439 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223480748 The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-22 18:27:35 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223480748 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223480940 The history of Earth concerns the development of planet Earth from its formation to the present day. 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 universe.]]> 2018-01-22 18:27:56 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223480940 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223481844 The time taken for the radioactivity of a specified isotope to fall to half its original value.]]> 2018-01-22 18:29:01 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223481844 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223482018 A method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-22 18:29:21 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223482018 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223482163 The determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content.]]> 2018-01-22 18:29:33 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223482163 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223482316 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 18:29:48 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223482316 305149 https://padlet.com/305149/80rcx25vhi8a/wish/223482586 Earth is 4.54 billion years old.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 18:30:11 UTC https://padlet.com/305149/80rcx25vhi8a/wish/223482586