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Geological Time 8

vocabulary practice

Geology a science that deals with the history of the earth as recorded in rocks
absolute age the age of a rock given as the number of years since the rock formed
era a major division of geological time
eon the longest division of geological time
fauna animal life; animals of a particular region or period
flora plants of a region or era
fossil record a historical sequence of life indicated by fossils found in layers of the Earth's crust
geological time scale A time scale established by geologists that reflects a consistent sequence of historical periods, grouped into four eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic.
law of superposition in a sequence of sedimentary rocks, the oldest rocks are on the bottom and the younger rocks are on the top
period a unit of geological time during which a system of rocks formed
radiometric dating using a radioactive process to determine the age of an item
relative age the age of rock compared to the ages of other rocks
Created by: amyshirey