Lecture 23

Lecture 23 - Lecture 23 GEOLOGIC TIME SCALE a method of...

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Lecture 23 GEOLOGIC TIME SCALE --- a method of indicating the age of the earth --- a sequence based on the relative positions of rock strata --- is a relative time scale --- assumes superposition : that younger rocks and sediments are near the top of a formation, & older material is near the bottom --- absolute ages are determined by dating methods such as radioactive isotope dating --- governed by uniformitarianism GEOLOGIC CYCLE --- The vast cycling of material that occurs in and on the lithosphere, encompassing the hydrologic, tectonic, & rock cycles -- the building and wearing down of landforms * 3 components: 1) hydrologic cycle - movement of water(H 2 O) 2) tectonic cycle - movement of crustal material and magma 3) rock cycle - formation of the three basic types of rock ROCK CYCLE What are rocks? --- mineral : an element or combination of elements that forms an inorganic natural compound which has specific qualities, such as a unique crystalline structure, hardness ect Ex: Silicates, based on silicon(Si); Carbonates, carbon(C)
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This note was uploaded on 04/30/2008 for the course GEOG 1111 taught by Professor Hopkins during the Spring '08 term at UGA.

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Lecture 23 - Lecture 23 GEOLOGIC TIME SCALE a method of...

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