https://padlet.com/304892/hajqruzllsb9 Made with a curious mind en-us 2018-01-16 17:39:11 UTC 2025-09-26 15:33:09 UTC hello@padlet.com 304892 https://padlet.com/304892/hajqruzllsb9/wish/221806172 a system of chronological dating that relates geological strata (stratigraphy) to time.]]> 2018-01-16 17:40:03 UTC https://padlet.com/304892/hajqruzllsb9/wish/221806172 304892 https://padlet.com/304892/hajqruzllsb9/wish/221806638 In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rockwhere formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.]]> 2018-01-16 17:41:07 UTC https://padlet.com/304892/hajqruzllsb9/wish/221806638 304892 https://padlet.com/304892/hajqruzllsb9/wish/221806902 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 17:41:40 UTC https://padlet.com/304892/hajqruzllsb9/wish/221806902 304892 https://padlet.com/304892/hajqruzllsb9/wish/221807147 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-16 17:42:12 UTC https://padlet.com/304892/hajqruzllsb9/wish/221807147 304892 https://padlet.com/304892/hajqruzllsb9/wish/221807448 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. ... Earthformed around 4.54 billion years ago by accretion from the solar nebula.]]> 2018-01-16 17:42:42 UTC https://padlet.com/304892/hajqruzllsb9/wish/221807448 304892 https://padlet.com/304892/hajqruzllsb9/wish/221807743 the time taken for the radioactivity of a specified isotope to fall to half its original value.]]> 2018-01-16 17:43:21 UTC https://padlet.com/304892/hajqruzllsb9/wish/221807743 304892 https://padlet.com/304892/hajqruzllsb9/wish/221808042 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-16 17:43:57 UTC https://padlet.com/304892/hajqruzllsb9/wish/221808042 304892 https://padlet.com/304892/hajqruzllsb9/wish/221808330 a technique for determining the age of organic materials, such as wood, based on their content of the radioisotope 14C acquired from the atmosphere when they formed part of a living plant. The 14C decays to the nitrogen isotope 14N with a half-life of 5730 years.]]> 2018-01-16 17:44:38 UTC https://padlet.com/304892/hajqruzllsb9/wish/221808330 304892 https://padlet.com/304892/hajqruzllsb9/wish/221808884 Radioactive decay (also known as nuclear decay orradioactivity) is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron ]]> 2018-01-16 17:45:47 UTC https://padlet.com/304892/hajqruzllsb9/wish/221808884 304892 https://padlet.com/304892/hajqruzllsb9/wish/221809602 The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 10⁹ years ± 1%). 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]]> 2018-01-16 17:47:14 UTC https://padlet.com/304892/hajqruzllsb9/wish/221809602