GEOCHAP13

GEOCHAP13 - GEO- Chapter 13 1. Structure and composition o...

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GEO- Chapter 13 1. Structure and composition o Seismic waves: shock waves through the planet Through explosions and earthquakes Primary waves: faster and are first to arrive at a seismograph Travel through all material Secondary waves: slower Travel through only solid o Planetary structure o Earths radius: 4000 miles o Inner structure: inner core, outer core, mantle, and crust Core: 1/3 rd earth’s mass, enormous pressure, iron and nickel Inner core: solid Outer core: molten lava Mantle: largest interior zones, solid rocky material, plastic solid Outermost layer: elastic solid Lithosphere: uppermost layer and crust (chemical composition) Asthenosphere: upper mantle o Tectonic forces: large scale forces that force earthquakes and mountains Moho discontinuity: interface between the mantle and crust with a significant change in density and abrupt increase in velocity of waves Crust: 1% earth’s mass, exterior of lithosphere Density: o Oceanic crust (basalic): heavy, iron, silicon, and magnesium o Continental crust (granitic): less dense, light colored rocks 2.
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This note was uploaded on 01/13/2012 for the course GEOG 101 taught by Professor Thebpanya during the Fall '07 term at Towson.

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GEOCHAP13 - GEO- Chapter 13 1. Structure and composition o...

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