Internal Structure of the Earth
n n n n
a) 90-100nkm
b) 50-60nkm
1. Whatnisnthenthicknessnofnthencrustnundernthen c) 70-80nkm
mountainousnareasnandninnparticularnthenHimal d) 30-40nkm
ayas? ViewnAnswer
a) 50-55nkm Answer:nd
b) 60-65nkm Explanation:nMohorovicicndiscontinuitynfromnsei
c) 70-75nkm smicnevidencenisndeterminednthatnitnisnapproxim
d) 30-35nkm atelynatnandepthnofn30-40nkm.
ViewnAnswer 6. WhatnisnthenspeednattainednbynthenP-
Answer:nc wavesninnthenC-
Explanation:nItnisnbelievednthatnthenthicknessnofnt layernundernthenContinentalncrust?
hencrustnundernthenHimalayasnisn70nton75nkmnan a) 6nton7.6nkm/sec
dnundernthenHindukushnitnisnsaidntonben60nkmnthic b) 3nton4nkm/sec
k. c) 5nton6.3nkm/sec
2. Thendiscontinuitynwhichnmarksnthenlowern d) 1.8nton2.5nkm/sec
boundarynofnthencrustnisn ViewnAnswer
a) Crust-Mantlendiscontinuity Answer:na
b) Oceanicndiscontinuity Explanation:nThenC-
c) SIALnlayer layernisnthenlowermostnlayernofnthencontinentalnc
d) Mohorovicicndiscontinuity rustnandnherenthenP-
nwavesnattainnvelocitynasnhighnasn6nton7.6nkm/se
ViewnAnswer
Answer:nd c.
Explanation:nMohorovicicndiscontinuitynmarksnt 7. Thenlayernundernthencontinentalncrustnwithn
henlowernboundarynofnthencrustnwhichnisnthenfirst thendensitynofn2.4nton2.6ng/ccnis?
nlayernof nthenEarth.
a) A-layer
3. Thengranitenlayerninnthencrustnisnalsonreferredn b) B-layer
tonasn c) C-layer
a) SIAL d) D-layer
b) SIMA ViewnAnswer
c) SLAM Answer:nb
d) SILA Explanation:nThenMiddlenlayernornB-
ViewnAnswer layernofnthencontinentalncrustnisnrelativelyndensen
Answer:na comparedntonA-
Explanation:nSIALnstandsnfornSiliconnandnAlumi layernandnthendensitynisnsaidntonben2.4nto
niumnandnasnpernthennamenitnisnmadenupnofnthent 2.6ng/cc.
wonelementsnandnhencenthenname. 8. ThenexpansionnofnSIMAnisn
4. Thendensitynofnthenoceanicnlayerninnthencrustni a) SiliconnandnManganese
snsaidntonben b) SiliconnandnMagnesium
a) 3.00ng/cc c) StrontiumnandnManganese
b) 2.50ng/cc d) StrontiumnandnMagnesium
c) 1.90ng/cc ViewnAnswer
d) 2.00ng/cc Answer:nb
ViewnAnswer Explanation:nSiliconnandnMagnesium.nThenC-
nlayernundernthencontinentalncrustnisnrichninnSilic
Answer:na
Explanation:nThenoceanicncrustnisnestimatednton onnandnMagnesiumnandnhencenthenlayernisnalson
havenanvolumenofn2.54*109nccnwithnannaveragen sometimesncallednSIMA.
densitynofn3.00ng/cc. 9. ThenoceanicnlayernisnthenextensionnofnC-
5. ThendepthnatnwhichnthenMohorovicicn layernofnthencontinentalncrustnandnAnandnB-
discontinuitynoccursnisn layernarenmostlynabsent.
a) True
1n|nPn an gn e
,b) False
ViewnAnswer
2n|nPn an gn e
,Answer:na dividednintontwonlayersnofn400nandn600nkmnthick
Explanation:nThenoceanicncrustnisnthenextensio nessnrespectively.
nnofnC-
layernofnthencontinentalncrustnthatnmakesnthento 3. Thenexactnnaturenofnthenmantlenisncompletelyn
pnlayernofnthenoceansninnmostncases,nAnandnBnla understood.
yersnbeingnpracticallynabsentnfromnthere. a) True
b) False
10. Thenleastndensenlayernamongnthenlayersnu ViewnAnswer
ndernthencontinentalncrustnisn Answer:nb
a) A-layer Explanation:nItnisnsaidnthatnthenexactnnaturenofnt
b) B-layer henmantlenisnasnyetnincompletelynunderstood.
c) C-layer
d) D-layer 4. Whichnofnthenfollowingnisnnotntruenaboutn
ViewnAnswer Asthenosphere?
a) Itnisnpresentninnthenuppernmantle
Answer:na
b) Itnisninnsolidnstate
Explanation:nThenAnornthenuppernlayernisnbetwee
c) Itnisnthensourcenofnvolcanicnactivity
nn2nton10nkmnthicknandnisnofnlowndensity,
d) Itnisninnplasticnrathernthannsolidnstate
2.00ng/cc.
ViewnAnswer
11. Thenareannotnconsiderednundernthencrustnis Answer:nb
Explanation:nItnisninnsolidnstatenisnnotntruenandnth
a) Mountainousnarea enremainingnoptionsnarentruenandntheynarenchara
b) Continentalnarea cteristicsnofnthenasthenosphere.nInnGreek,n“asth
c) Oceanicnarea enes”nmeansnwithoutnstrengthnandnhencenthenn
d) Glacialnarea ame.
ViewnAnswer
Answer:nd 5. Whonwasnthenfirstnpersonntontellnaboutnthen
Explanation:nThenfirstnthenoptions,nMountainou Core?
s,nContinentalnandnOceanicnareasnarenstudiedns a) GrahamnBell
eparatelynwhereasnGlacialnareanisnnotnconsider b) AlbertnEinstein
ednundernstudynofnthencrustnasnsuch. c) IsaacnNewton
d) R.D.nOldham
1. Thendepthnupntonwhichnthenmantlenisnsaidnton ViewnAnswer
existnisn Answer:nd
a) 2000nkm Explanation:nThenexistencenofnthencorenwasnsu
b) 1500nkm ggestednbynR.D.nOldhamninn1906nandnsubsequ
c) 2900nkm entlynconfirmednbynothernseismologists.
d) 1800nkm
ViewnAnswer 6. Thendepthnatnwhichnthencorenlayernstartsnandn
endsnrespectivelynisn
Answer:nc
a) 2900nandn6371nkm
Explanation:nThensecondnlayer,nMantle,nliesnben
b) 2000nandn5371nkm
eathnthencrustnandnthisnzonenstartingnfromnthenlo
c) 2500nandn4771nkm
wernboundarynofnthencrustncontinuesnupntonandept
d) 2000nandn5000nkm
hnofn2,900nkm.
ViewnAnswer
2. Thenthicknessnofnthen2nlayersnofnthenuppern Answer:na
mantlenisnapproximatelynsaidntonben Explanation:nThenmantlenextendsnupntonthendept
a) 400nandn600nkm hnofn2900nkmnandnfromnthatndepthnitnisnthencorent
b) 300nandn500nkm hatnisnsaidntonbenpresentnandnthenradiusnofnthenE
c) 450nandn800nkm arthnisn6371nkmnandnhencenthencorenisnsaidntonex
d) 300nandn400nkm tendntilln6371nkm.
ViewnAnswer
7. Whichnofnthenfollowingnisntruenaboutntheninnern
Answer:na
core?
Explanation:nThenuppernmantlenisnfurther
3n|nPn an gn e
, a) Itnisnbelievedntonbenanseminsolidnbody g/ccnatnthenboundarynofntheninnerncorenandnbecom
b) Itnisnbelievedntonbenansolidnbody esn13ng/ccnatnthencentrenofnthenEarth.
c) Itnisnbelievedntonbenanliquidnbody
d) Itnisnbelievedntonbenangaseousnbody. 12. Thenlayernwhichnisnsaidntonsupportnthenslown
ViewnAnswer movingntectonicnplatesnisn
a) Asthenosphere
Answer:nb
Explanation:nTheninnerncorenwithnanthicknessnofn b) Lithosphere
c) Mohorovicnsphere
aroundn1790nkmnisnbelievedntonbenansolidnbody.
d) Corenlayer
8. ThendensitynofnthenEarthninnthencorenim ViewnAnswer
mediatelynafternthenmantlenisn Answer:na
a) 8ng/cc Explanation:nThenAsthenospherenisnbelievedntonb
b) 7.6ng/cc enlocatednentirelyninnthenuppernmantlenandnsuppor
c) 9.9ng/cc tsnthenslowlynmovingntectonicnplates.
d) 8.7ng/cc
ViewnAnswer 13. Whatnisnthenthicknessnofntheninnerncore?
a) 790nkm
Answer:nc
b) 1790nkm
Explanation:nAtnthenbasenofnthenmantle,ndensityn
c) 2790nkm
isninferrednasn5.7ng/ccnthatnjumpsnton9.9ng/ccnatnt
d) 3790nkm
hentopnofnthencore.
ViewnAnswer
9. ThenlayernwhichndoesnnotntransmitnthenS- Answer:nb
nwavesnisn Explanation:nTheninnerncore,nisnbelievedntonbeni
a) Outerncore nnsolidnmetallicnstatenandnisnsaidnhaventhicknes
b) Crust snofnaboutn1790nkm.
c) Mantle
d) Innerncore 14. Thenlayernwhichnisnbelievedntonbenthen
ViewnAnswer sourcenofnvolcanicnactivitynisn
Answer:na a) Innerncore
Explanation:nThenouterncorenbehavesnmorenliken b) Outerncore
c) Asthenosphere
anliquidnbecausenthenS-
d) Mohorovicicnlayer
wavesnfromnthenearthquakenshocksnreachingnthi
snzonenarennotntransmittednthroughnthisnzonenatn ViewnAnswer
all. Answer:nc
Explanation:nThenasthenospherenisnbelievednton
10. Therenisnanhypothesisnthatntheninnerncorenisn benthensourcenofnmuchnvolcanicnactivitynandnma
madenupnchieflynofnironnandnnickel. nynothernprocesses.nItnisnsaidnbentonlocatedncom
a) True pletelyninnthenuppernmantle.
b) False
ViewnAnswer Atmosphere
Answer:na
Explanation:nAsnregardsnthenchemicalncompositi
onnofntheninnerncore,nthenhypothesisnthatnitnisnmad 1. Whichnofnthenfollowingnaboutnweatheringnisn
enupnchieflynofnironnandnnickelnelementsnhasnfou notntrue?
ndnsupportnfromnmanynaccounts. a) Itnisnannaturalnprocess
b) Mechanicalndisintegrationnisninvolved
11. ThendensitynofnthenEarthnatnitsncentrenisnsaidnt c) Chemicalndecompositionnisninvolved
onben d) Itnisnanrapidnprocess
a) 9.9ng/cc ViewnAnswer
b) 8.8ng/cc Answer:nd
c) 13ng/cc Explanation:nWeatheringnisndefinednas,nannatur
d) 12.7ng/cc alnprocessnofnin-
ViewnAnswer
situnmechanicalndisintegrationnandnornchemicaln
Answer:nc decompositionnofnthenrocksnofnthencrustnofnthenE
arthnbyncertain
4n|nPn an gn e
n n n n
a) 90-100nkm
b) 50-60nkm
1. Whatnisnthenthicknessnofnthencrustnundernthen c) 70-80nkm
mountainousnareasnandninnparticularnthenHimal d) 30-40nkm
ayas? ViewnAnswer
a) 50-55nkm Answer:nd
b) 60-65nkm Explanation:nMohorovicicndiscontinuitynfromnsei
c) 70-75nkm smicnevidencenisndeterminednthatnitnisnapproxim
d) 30-35nkm atelynatnandepthnofn30-40nkm.
ViewnAnswer 6. WhatnisnthenspeednattainednbynthenP-
Answer:nc wavesninnthenC-
Explanation:nItnisnbelievednthatnthenthicknessnofnt layernundernthenContinentalncrust?
hencrustnundernthenHimalayasnisn70nton75nkmnan a) 6nton7.6nkm/sec
dnundernthenHindukushnitnisnsaidntonben60nkmnthic b) 3nton4nkm/sec
k. c) 5nton6.3nkm/sec
2. Thendiscontinuitynwhichnmarksnthenlowern d) 1.8nton2.5nkm/sec
boundarynofnthencrustnisn ViewnAnswer
a) Crust-Mantlendiscontinuity Answer:na
b) Oceanicndiscontinuity Explanation:nThenC-
c) SIALnlayer layernisnthenlowermostnlayernofnthencontinentalnc
d) Mohorovicicndiscontinuity rustnandnherenthenP-
nwavesnattainnvelocitynasnhighnasn6nton7.6nkm/se
ViewnAnswer
Answer:nd c.
Explanation:nMohorovicicndiscontinuitynmarksnt 7. Thenlayernundernthencontinentalncrustnwithn
henlowernboundarynofnthencrustnwhichnisnthenfirst thendensitynofn2.4nton2.6ng/ccnis?
nlayernof nthenEarth.
a) A-layer
3. Thengranitenlayerninnthencrustnisnalsonreferredn b) B-layer
tonasn c) C-layer
a) SIAL d) D-layer
b) SIMA ViewnAnswer
c) SLAM Answer:nb
d) SILA Explanation:nThenMiddlenlayernornB-
ViewnAnswer layernofnthencontinentalncrustnisnrelativelyndensen
Answer:na comparedntonA-
Explanation:nSIALnstandsnfornSiliconnandnAlumi layernandnthendensitynisnsaidntonben2.4nto
niumnandnasnpernthennamenitnisnmadenupnofnthent 2.6ng/cc.
wonelementsnandnhencenthenname. 8. ThenexpansionnofnSIMAnisn
4. Thendensitynofnthenoceanicnlayerninnthencrustni a) SiliconnandnManganese
snsaidntonben b) SiliconnandnMagnesium
a) 3.00ng/cc c) StrontiumnandnManganese
b) 2.50ng/cc d) StrontiumnandnMagnesium
c) 1.90ng/cc ViewnAnswer
d) 2.00ng/cc Answer:nb
ViewnAnswer Explanation:nSiliconnandnMagnesium.nThenC-
nlayernundernthencontinentalncrustnisnrichninnSilic
Answer:na
Explanation:nThenoceanicncrustnisnestimatednton onnandnMagnesiumnandnhencenthenlayernisnalson
havenanvolumenofn2.54*109nccnwithnannaveragen sometimesncallednSIMA.
densitynofn3.00ng/cc. 9. ThenoceanicnlayernisnthenextensionnofnC-
5. ThendepthnatnwhichnthenMohorovicicn layernofnthencontinentalncrustnandnAnandnB-
discontinuitynoccursnisn layernarenmostlynabsent.
a) True
1n|nPn an gn e
,b) False
ViewnAnswer
2n|nPn an gn e
,Answer:na dividednintontwonlayersnofn400nandn600nkmnthick
Explanation:nThenoceanicncrustnisnthenextensio nessnrespectively.
nnofnC-
layernofnthencontinentalncrustnthatnmakesnthento 3. Thenexactnnaturenofnthenmantlenisncompletelyn
pnlayernofnthenoceansninnmostncases,nAnandnBnla understood.
yersnbeingnpracticallynabsentnfromnthere. a) True
b) False
10. Thenleastndensenlayernamongnthenlayersnu ViewnAnswer
ndernthencontinentalncrustnisn Answer:nb
a) A-layer Explanation:nItnisnsaidnthatnthenexactnnaturenofnt
b) B-layer henmantlenisnasnyetnincompletelynunderstood.
c) C-layer
d) D-layer 4. Whichnofnthenfollowingnisnnotntruenaboutn
ViewnAnswer Asthenosphere?
a) Itnisnpresentninnthenuppernmantle
Answer:na
b) Itnisninnsolidnstate
Explanation:nThenAnornthenuppernlayernisnbetwee
c) Itnisnthensourcenofnvolcanicnactivity
nn2nton10nkmnthicknandnisnofnlowndensity,
d) Itnisninnplasticnrathernthannsolidnstate
2.00ng/cc.
ViewnAnswer
11. Thenareannotnconsiderednundernthencrustnis Answer:nb
Explanation:nItnisninnsolidnstatenisnnotntruenandnth
a) Mountainousnarea enremainingnoptionsnarentruenandntheynarenchara
b) Continentalnarea cteristicsnofnthenasthenosphere.nInnGreek,n“asth
c) Oceanicnarea enes”nmeansnwithoutnstrengthnandnhencenthenn
d) Glacialnarea ame.
ViewnAnswer
Answer:nd 5. Whonwasnthenfirstnpersonntontellnaboutnthen
Explanation:nThenfirstnthenoptions,nMountainou Core?
s,nContinentalnandnOceanicnareasnarenstudiedns a) GrahamnBell
eparatelynwhereasnGlacialnareanisnnotnconsider b) AlbertnEinstein
ednundernstudynofnthencrustnasnsuch. c) IsaacnNewton
d) R.D.nOldham
1. Thendepthnupntonwhichnthenmantlenisnsaidnton ViewnAnswer
existnisn Answer:nd
a) 2000nkm Explanation:nThenexistencenofnthencorenwasnsu
b) 1500nkm ggestednbynR.D.nOldhamninn1906nandnsubsequ
c) 2900nkm entlynconfirmednbynothernseismologists.
d) 1800nkm
ViewnAnswer 6. Thendepthnatnwhichnthencorenlayernstartsnandn
endsnrespectivelynisn
Answer:nc
a) 2900nandn6371nkm
Explanation:nThensecondnlayer,nMantle,nliesnben
b) 2000nandn5371nkm
eathnthencrustnandnthisnzonenstartingnfromnthenlo
c) 2500nandn4771nkm
wernboundarynofnthencrustncontinuesnupntonandept
d) 2000nandn5000nkm
hnofn2,900nkm.
ViewnAnswer
2. Thenthicknessnofnthen2nlayersnofnthenuppern Answer:na
mantlenisnapproximatelynsaidntonben Explanation:nThenmantlenextendsnupntonthendept
a) 400nandn600nkm hnofn2900nkmnandnfromnthatndepthnitnisnthencorent
b) 300nandn500nkm hatnisnsaidntonbenpresentnandnthenradiusnofnthenE
c) 450nandn800nkm arthnisn6371nkmnandnhencenthencorenisnsaidntonex
d) 300nandn400nkm tendntilln6371nkm.
ViewnAnswer
7. Whichnofnthenfollowingnisntruenaboutntheninnern
Answer:na
core?
Explanation:nThenuppernmantlenisnfurther
3n|nPn an gn e
, a) Itnisnbelievedntonbenanseminsolidnbody g/ccnatnthenboundarynofntheninnerncorenandnbecom
b) Itnisnbelievedntonbenansolidnbody esn13ng/ccnatnthencentrenofnthenEarth.
c) Itnisnbelievedntonbenanliquidnbody
d) Itnisnbelievedntonbenangaseousnbody. 12. Thenlayernwhichnisnsaidntonsupportnthenslown
ViewnAnswer movingntectonicnplatesnisn
a) Asthenosphere
Answer:nb
Explanation:nTheninnerncorenwithnanthicknessnofn b) Lithosphere
c) Mohorovicnsphere
aroundn1790nkmnisnbelievedntonbenansolidnbody.
d) Corenlayer
8. ThendensitynofnthenEarthninnthencorenim ViewnAnswer
mediatelynafternthenmantlenisn Answer:na
a) 8ng/cc Explanation:nThenAsthenospherenisnbelievedntonb
b) 7.6ng/cc enlocatednentirelyninnthenuppernmantlenandnsuppor
c) 9.9ng/cc tsnthenslowlynmovingntectonicnplates.
d) 8.7ng/cc
ViewnAnswer 13. Whatnisnthenthicknessnofntheninnerncore?
a) 790nkm
Answer:nc
b) 1790nkm
Explanation:nAtnthenbasenofnthenmantle,ndensityn
c) 2790nkm
isninferrednasn5.7ng/ccnthatnjumpsnton9.9ng/ccnatnt
d) 3790nkm
hentopnofnthencore.
ViewnAnswer
9. ThenlayernwhichndoesnnotntransmitnthenS- Answer:nb
nwavesnisn Explanation:nTheninnerncore,nisnbelievedntonbeni
a) Outerncore nnsolidnmetallicnstatenandnisnsaidnhaventhicknes
b) Crust snofnaboutn1790nkm.
c) Mantle
d) Innerncore 14. Thenlayernwhichnisnbelievedntonbenthen
ViewnAnswer sourcenofnvolcanicnactivitynisn
Answer:na a) Innerncore
Explanation:nThenouterncorenbehavesnmorenliken b) Outerncore
c) Asthenosphere
anliquidnbecausenthenS-
d) Mohorovicicnlayer
wavesnfromnthenearthquakenshocksnreachingnthi
snzonenarennotntransmittednthroughnthisnzonenatn ViewnAnswer
all. Answer:nc
Explanation:nThenasthenospherenisnbelievednton
10. Therenisnanhypothesisnthatntheninnerncorenisn benthensourcenofnmuchnvolcanicnactivitynandnma
madenupnchieflynofnironnandnnickel. nynothernprocesses.nItnisnsaidnbentonlocatedncom
a) True pletelyninnthenuppernmantle.
b) False
ViewnAnswer Atmosphere
Answer:na
Explanation:nAsnregardsnthenchemicalncompositi
onnofntheninnerncore,nthenhypothesisnthatnitnisnmad 1. Whichnofnthenfollowingnaboutnweatheringnisn
enupnchieflynofnironnandnnickelnelementsnhasnfou notntrue?
ndnsupportnfromnmanynaccounts. a) Itnisnannaturalnprocess
b) Mechanicalndisintegrationnisninvolved
11. ThendensitynofnthenEarthnatnitsncentrenisnsaidnt c) Chemicalndecompositionnisninvolved
onben d) Itnisnanrapidnprocess
a) 9.9ng/cc ViewnAnswer
b) 8.8ng/cc Answer:nd
c) 13ng/cc Explanation:nWeatheringnisndefinednas,nannatur
d) 12.7ng/cc alnprocessnofnin-
ViewnAnswer
situnmechanicalndisintegrationnandnornchemicaln
Answer:nc decompositionnofnthenrocksnofnthencrustnofnthenE
arthnbyncertain
4n|nPn an gn e
