https://padlet.com/coineg/m55vutewi1ep Emily Coin - Assignment 7.4 Honors en-us 2017-07-11 01:19:30 UTC 2017-07-11 01:42:42 UTC hello@padlet.com coineg https://padlet.com/coineg/m55vutewi1ep/wish/178434553 It is human nature to desire to know the origin of the Earth. When geologists find rocks, much of their study is to show how old the rock is and where it originated. Information found from digging into these questions can help us to discover the age of the Earth, our solar system, and even our galaxy as well as answering other questions about life on this planet.]]> 2017-07-11 01:22:13 UTC https://padlet.com/coineg/m55vutewi1ep/wish/178434553 coineg https://padlet.com/coineg/m55vutewi1ep/wish/178434738 This is the process of studying rock layers to determine their age relative to one another. This and similar techniques were used for much of the 18th and 19th century in the study of geology. William Smith was a pioneer in using these methods to determine the age of fossils he found scattered across sedimentary rock beds in Southern England.]]> 2017-07-11 01:24:21 UTC https://padlet.com/coineg/m55vutewi1ep/wish/178434738 coineg https://padlet.com/coineg/m55vutewi1ep/wish/178434884 1) Principle of Superposition: younger sedimentary rocks are found in deposits on top of older sedimentary rocks.
2) Principle of cross-cutting relations: Geologic features that cut across another are younger than what they cut across.]]> 2017-07-11 01:27:13 UTC https://padlet.com/coineg/m55vutewi1ep/wish/178434884 coineg https://padlet.com/coineg/m55vutewi1ep/wish/178435331 1) McKinney, Frank K. "Determining Age of Rocks and Fossils." University of California Museum of Paleontology. University of California, Berkeley, n.d. Web.
2) "Radiometric Time Scale." The United States Geological Survey. United States Department of the Interior, 13 June 2001. Web.

]]> 2017-07-11 01:34:35 UTC https://padlet.com/coineg/m55vutewi1ep/wish/178435331 coineg https://padlet.com/coineg/m55vutewi1ep/wish/178435557 A far more accurate yet extremely complex measure of rock and fossil dating, radiometric dating methods first came about with French physicist Henry Becquerel's discovery of uranium's natural radioactive decay cycle. The ratio of unstable parent isotopes and decayed daughter isotopes in a rock/fossil can allow scientists to pinpoint a nearly exact age.]]> 2017-07-11 01:38:24 UTC https://padlet.com/coineg/m55vutewi1ep/wish/178435557