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Chapter 4

Chapter 4 notes

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Environmental Science
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Nick Eyles

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Chapter 4: The Earths Interior Geophysics application of physical laws and principles to a study of the Earth (includes study of seismic waves and Earths magnetic field, gravity, and heat) WHAT CAN WE LEARN FROM THE STUDY OF SEISMIC WAVES? Seismic Reflection return of some energy of seismic waves to the Earths surface after waves bounce off a rock boundary Seismic Refraction bending of seismic waves as they pass from one material to another (similar to how light waves bend when passing through lenses of eyeglasses. Diagram 4.3 pg. 107 (Station 1 and Station 2) WHAT IS INSIDE THE EARTH? Crust outer layer of rock, which forms thin skin on Earths surface Mantle lies below crust, thick shell of rock that separates crust above from core below Core central zone of Earth, probably metallic and source of Earths magnetic field The Crust Seismic waves travel faster in oceanic crust than in continental crust Seismic P waves travel through oceanic crust at about 7 kmsec and through continental crust at about 6 kmsec Average thickness of oceanic crust is 7 km varying from 5-8 km. Avg. thickness of continental crust 30-50 km varying from 10-70 km. Felsic rocks high in feldspar, Silicon for continental crust, Mafic rocks high in magnesium and iron (ferric) for oceanic crust Continental crust less dense the oceanic crust Mohorovii discontinuity (Moho) boundary separating crust from mantle beneath The Mantle Geoscientists interpret it to be made of solid rock P waves travel at about 8 kmsec in upper mantle Mantle different type of rock from oceanic or continental crust, hypothesis of geoscientists say it is made up of Ultramafic rock Ultramafic Rock dense igneous rock compose mainly of ferromagnesian minerals such as olivine and pyroxene www.notesolution.com
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