https://padlet.com/305130/56jeudgo4o6j Made with a taste for adventure en-us 2018-01-16 22:43:08 UTC 2025-04-27 18:03:54 UTC hello@padlet.com 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221910854 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.]]> 2018-01-16 22:44:00 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221910854 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221911154 In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock where formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.]]> 2018-01-16 22:45:45 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221911154 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221911313 the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.]]> 2018-01-16 22:46:44 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221911313 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221911598 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-16 22:48:55 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221911598 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221911719 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.]]> 2018-01-16 22:49:55 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221911719 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221911859 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.]]> 2018-01-16 22:51:22 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221911859 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221911927 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-16 22:51:57 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221911927 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221912241 another term for carbon dating.]]> 2018-01-16 22:55:05 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221912241 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221912338 radioactive decay. (rā'dē-ō-āk'tĭv) 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.]]> 2018-01-16 22:56:07 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221912338 305130 https://padlet.com/305130/56jeudgo4o6j/wish/221912497 Since the planet Earth doesn't have a birth certificate to record its formation, scientists have spent hundreds of years struggling to determine the age of the planet. By dating the rocks in the ever-changing crust, as well as neighbors such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.]]> 2018-01-16 22:57:32 UTC https://padlet.com/305130/56jeudgo4o6j/wish/221912497