https://padlet.com/3063711/gqjxjgj7fm1f Made with mirth en-us 2018-01-16 21:50:26 UTC 2018-01-16 22:11:13 UTC hello@padlet.com 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221901251  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 21:51:59 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221901251 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902455 The geologic time scale 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]]> 2018-01-16 21:56:11 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902455 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902717
In geology and related fields, a stratum 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 21:57:17 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902717 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902804 The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock.]]> 2018-01-16 21:57:38 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902804 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902912 A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, hair, petrified wood, oil, coal, and DNA remnants.]]> 2018-01-16 21:58:07 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902912 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902942 The history of Earth concerns the development of planet Earth from its formation to the present day. ... Earth formed around 4.54 billion years ago by accretion from the solar nebula.

]]> 2018-01-16 21:58:15 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221902942 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903016 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 21:58:33 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903016 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903070 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 21:58:50 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903070 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903152 Radioactive decay (also known as nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy]]> 2018-01-16 21:59:16 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903152 3063711 https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903182 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 21:59:26 UTC https://padlet.com/3063711/gqjxjgj7fm1f/wish/221903182