GEOLOGY 105 Study Guide - Quiz Guide: Radiometric Dating, Oldest Dated Rocks, Oceanic Crust
4 Oct 2016
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Earth"s crust that are constantly moving around: largest recorded earthquake chile, 1960 (9. 5) We have a long time to do small things. In geology, we often speak of time in millions of years, ma (mega-annums) Bishop usher- calculated that the earth was formed at 9:00a. m on october. Recognized that the earth had to be much older. Proposed his principle of uniformitarianism: geological processes that we see operating today are the same processes that operated in the past, assessed rock structures. Law of superposition-the oldest stuff must be on the bottom. A few mm each year: unconformity- a gap in time, no vestige of a beginning, no sign of an end . There are two kinds of ways to tell time geologically: relative age- something is older or younger then something else, absolute age- sometimes we can tell the absolute age of how much older/younger something is than another thing. There are two ways to date: use of fossils, radiometric dating.
