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Transcript
CHAPTER 9 HOW DO WE KNOW ABOUT THE CORE OF THE EARTH? MUST BE DONE FROM OUTSIDE • EXAMINE ROCK • MONITOR EVENTS • EXAMINE FORMATIONS EARTHQUAKE • MOVEMENT OF THE EARTHS CRUST SEISMOGRAPH • MACHINE USED TO MEASURE STRENGTH OF AN EARTHQUAKE OR TREMOR Seismogram • Measure the lines P waves • Move through all S waves • Surface waves • Move only through solid crust • Solid outer part of earth mantle • Largest – thickest • Molten Layer of earth Outer core • Liquid layer of core Inner core • Solid layer of core • Why solid????? moho • Between mantle and crust • Has plasticity- solid acting like a liquid • Plates move on it
