https://padlet.com/304963/2tzcajpa8mnp Made with serendipity en-us 2018-01-17 01:05:03 UTC 2025-06-18 13:03:10 UTC hello@padlet.com 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221925872  A system of chronological dating that relates geological strata (stratigraphy) to time.]]> 2018-01-17 01:06:14 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221925872 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221928136 In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock were formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.]]> 2018-01-17 01:23:42 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221928136 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221928346 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.]]> 2018-01-17 01:25:56 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221928346 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221928524 the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.]]> 2018-01-17 01:27:20 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221928524 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221928694 The history of Earth concerns the development of planet Earth from its formation to the present day.

]]> 2018-01-17 01:29:05 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221928694 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221928871 the time required for one half the atoms of a given amount of a radioactive substance to disintegrate. ]]> 2018-01-17 01:30:54 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221928871 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221929186 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.]]> 2018-01-17 01:33:48 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221929186 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221929338 measurement of the amount of radioactive material usually carbon that an object contains.]]> 2018-01-17 01:35:22 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221929338 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221929801 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.]]> 2018-01-17 01:40:23 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221929801 304963 https://padlet.com/304963/2tzcajpa8mnp/wish/221929997 The age of the Earth is approximately 4.54 ± 0.05 billion years.  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.]]> 2018-01-17 01:42:14 UTC https://padlet.com/304963/2tzcajpa8mnp/wish/221929997