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www.poormansfriend.orgVideo Series on Geography
(GS)www.poormansfriend.orgINTERIOR OF THE EARTH
INTERIOR OF THE EARTH
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INTERIOR OF THE EARTHwww.pmfias.com
INTERIOR OF THE EARTHWhy know about Earths
Interiorwww.pmfias.com
www.poormansfriend.orgINTERIOR OF THE EARTHSources of
information about the interior
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www.poormansfriend.orgINTERIOR OF THE EARTHExplanation for some
sourcesEvidences from Meteorites
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www.poormansfriend.orgINTERIOR OF THE EARTHExplanation for some
sourcesSeismic waves
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www.poormansfriend.orgTypes of Earthquake Waves (Seismic
waves)INTERIOR OF THE EARTH
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www.poormansfriend.orgTypes of Earthquake Waves (Seismic
waves)INTERIOR OF THE EARTHPrimary waves or P-wavesLongitudinal
waves or Compressional wavesHigh frequency long wavelengthFirst to
arrive at the surface.Travel in all mediumsVelocity: Solid >
Liquids > Gases
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www.poormansfriend.orgTypes of Earthquake Waves (Seismic
waves)INTERIOR OF THE EARTHSecondary waves or S-wavesTransverse
waves or distortional wavesHigh frequency long wavelengthArrives
after P-wavesCannot travel in liquids and
gases.www.poormansfriend.org
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www.poormansfriend.orgTypes of Earthquake Waves (Seismic
waves)INTERIOR OF THE EARTHSurface wavesTransverse waves Low
frequency and long wavelengths P-waves and S-waves interact with
rocks to generate Surface wavesLocalized wavesMost
destructivewww.poormansfriend.org
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www.poormansfriend.orgShadow zoneINTERIOR OF THE
EARTHS-waves
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www.poormansfriend.orgShadow zoneINTERIOR OF THE
EARTHP-waveswww.poormansfriend.org
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General Science related Why does sound wave travel faster in a
denser medium whereas light travels slower?Why S-waves cannot
travel through liquids?INTERIOR OF THE
EARTHwww.poormansfriend.orgwww.pmfias.com
www.poormansfriend.orgLayers of Earth
INTERIOR OF THE EARTHwww.poormansfriend.orgwww.pmfias.com
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Layers of EarthINTERIOR OF THE EARTH
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Layers of EarthINTERIOR OF THE EARTHSurface to Mohorovic
discontinuity30-50 km; 30-100 km; 5-30 km0.5 1.0 %Density
2-3.Surface made of granitic rocksBelow layer is igneous and
metamorphic (acidic)Bottom layer basic and ultrabasic
rockswww.poormansfriend.orgCrustwww.pmfias.com
www.poormansfriend.orgLayers of EarthINTERIOR OF THE
EARTH35-2900 km; 16%Solid rock and magmaDensity ~3; In lower parts
3.3 5.7 Outer layer is partly simaticInner layer is simatic with
ultrabasic rocks.AsthenosphereM-discontinuity to 400kmImportant
role in plate tectonicswww.poormansfriend.org
Mantlewww.pmfias.com
www.poormansfriend.orgLayers of EarthINTERIOR OF THE EARTH2900
6400 km83%Gutenberg discontinuity A zone of mixed heavy metals +
silicates separates the core from outer layersNifeOuter core
liquidInner core solidDensity varies from 10 to
13www.poormansfriend.orgCore
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www.poormansfriend.orgComposition of Earths CrustINTERIOR OF THE
EARTH
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www.poormansfriend.orgComposition of Earthwww.pmfias.com
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EARTHwww.poormansfriend.orgQuestions from Previous PapersIn the
structure of planet Earth, below the mantle, the core is mainly
made up of which one of the following? , [2009]Aluminium
ChromiumIron Siliconwww.pmfias.com
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