https://padlet.com/3096811/nzri15jbq8t3 en-us 2018-01-16 22:42:41 UTC 2023-06-03 05:19:16 UTC hello@padlet.com 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221911074 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 22:45:22 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221911074 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221911442 the time taken for the radioactivity of a specified isotope to fall to half its original value.
the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.]]> 2018-01-16 22:47:44 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221911442 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221911765 an antiquated or stubbornly unchanging person or thing.
a word or phrase that has become obsolete except in set phrases or forms, e.g., hue in hue and cry.

]]> 2018-01-16 22:50:24 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221911765 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221911955 Earth definition. The planet on which we live — the third planet from the sun. Note: The Earth was formed at the same time as the sun, about 4.6 billion years ago. ... Note: On the Earth's surface, the oceans and the continents form the stage on which the evolution of life takes place.

]]> 2018-01-16 22:52:15 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221911955 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221912084 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 22:53:39 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221912084 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221912239 a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.

]]> 2018-01-16 22:55:03 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221912239 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221912373 another term for carbon dating.

]]> 2018-01-16 22:56:19 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221912373 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221912516 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 22:57:44 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221912516 3096811 https://padlet.com/3096811/nzri15jbq8t3/wish/221912699 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 22:59:18 UTC https://padlet.com/3096811/nzri15jbq8t3/wish/221912699