https://padlet.com/3048221/y10q4go8c1t2 Made with a wink and a smile en-us 2018-01-16 20:21:00 UTC 2025-10-21 06:49:21 UTC hello@padlet.com 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221877023 The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.]]> 2018-01-16 20:23:03 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221877023 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221879892 In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil.]]> 2018-01-16 20:31:48 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221879892 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221881238 the half-life of a radioactive substance is the amount of time it takes for half of its atoms to decay, and the half-life of a drug is the amount of time it takes before half of the active elements are either eliminated or broken down by the body.]]> 2018-01-16 20:36:05 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221881238 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221881944 A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age. ]]> 2018-01-16 20:38:20 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221881944 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221882462 The history of Earth concerns the development of planet Earth from its formation to the present day. ]]> 2018-01-16 20:39:56 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221882462 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221882982 The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. ]]> 2018-01-16 20:41:30 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221882982 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221883307 Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.]]> 2018-01-16 20:42:35 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221883307 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221883656 Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.]]> 2018-01-16 20:43:53 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221883656 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221883942  the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation,]]> 2018-01-16 20:44:49 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221883942 3048221 https://padlet.com/3048221/y10q4go8c1t2/wish/221884514 The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 10⁹ years ± 1%). ]]> 2018-01-16 20:46:38 UTC https://padlet.com/3048221/y10q4go8c1t2/wish/221884514