InternalgStructuregofgthegEarth a) 90-100gkm
b) 50-60gkm
1. Whatgisgthegthicknessgofgthegcrustgundergth c) 70-80gkm
egmountainousgareasgandgingparticulargthegHi d) 30-40gkm
malayas? ViewgAnswer
a) 50-55gkm Answer:gd
b) 60-65gkm Explanation:gMohorovicicgdiscontinuitygfromgse
c) 70-75gkm ismicgevidencegisgdeterminedgthatgitgisgapproxi
d) 30-35gkm matelygatgagdepthgofg30-40gkm.
ViewgAnswer 6. WhatgisgthegspeedgattainedgbygthegP-
Answer:gc wavesgingthegC-
Explanation:gItgisgbelievedgthatgthegthicknessgo layergundergthegContinentalgcrust?
fgthegcrustgundergthegHimalayasgisg70gtog75gk a) 6gtog7.6gkm/sec
mgandgundergthegHindukushgitgisgsaidgtogbeg60 b) 3gtog4gkm/sec
gkm gthick.
c) 5gtog6.3gkm/sec
2. Thegdiscontinuitygwhichgmarksgtheglowe d) 1.8gtog2.5gkm/sec
rgboundarygofgthegcrustgisg ViewgAnswer
a) Crust-Mantlegdiscontinuity Answer:ga
b) Oceanicgdiscontinuity Explanation:gThegC-
c) SIALglayer layergisgtheglowermostglayergofgthegcontinental
d) Mohorovicicgdiscontinuity gcrustgandgheregthegP-
gwavesgattaingvelocitygasghighgasg6gtog7.6gkm/
ViewgAnswer
Answer:gd sec.
Explanation:gMohorovicicgdiscontinuitygmarksgt 7. Theglayergundergthegcontinentalgcrustgwit
heglowergboundarygofgthegcrustgwhichgisgthegfir hgthegdensitygofg2.4gtog2.6gg/ccgis?
stglayergofgthegEarth. a) A-layer
3. Theggraniteglayergingthegcrustgisgalsogreferre b) B-layer
dgtogasg c) C-layer
a) SIAL d) D-layer
b) SIMA ViewgAnswer
c) SLAM Answer:gb
d) SILA Explanation:gThegMiddleglayergorgB-
ViewgAnswer layergofgthegcontinentalgcrustgisgrelativelygdens
Answer:ga egcomparedgtogA-
Explanation:gSIALgstandsgforgSilicongandgAlu layergandgthegdensitygisgsaidgtogbeg2.4gto
miniumgandgasgpergthegnamegitgisgmadegupgofg 2.6gg/cc.
thegtwogelementsgandghencegthegname. 8. ThegexpansiongofgSIMAgisg
4. Thegdensitygofgthegoceanicglayergingthegcru a) SilicongandgManganese
stgisgsaidgtogbeg b) SilicongandgMagnesium
a) 3.00gg/cc c) StrontiumgandgManganese
b) 2.50gg/cc d) StrontiumgandgMagnesium
c) 1.90gg/cc ViewgAnswer
d) 2.00gg/cc Answer:gb
ViewgAnswer Explanation:gSilicongandgMagnesium.gThegC-
Answer:ga glayergundergthegcontinentalgcrustgisgrichgingSili
Explanation:gThegoceanicgcrustgisgestimatedgt congandgMagnesiumgandghencegtheglayergisgal
oghavegagvolumegofg2.54*109gccgwithgangaver sogsometimesgcalledgSIMA.
agegdensitygofg3.00gg/cc. 9. ThegoceanicglayergisgthegextensiongofgC-
5. ThegdepthgatgwhichgthegMohorovici layergofgthegcontinentalgcrustgandgAgandgB-
cgdiscontinuitygoccursgisg layergaregmostlygabsent.
a) True
1
g|gPg ag gg e
,b) False
ViewgAnswer
2
g|gPg ag gg e
,Answer:ga dividedgintogtwoglayersgofg400gandg600gkmgthic
Explanation:gThegoceanicgcrustgisgthegextensi knessgrespectively.
ongofgC-
layergofgthegcontinentalgcrustgthatgmakesgthegt 3. Thegexactgnaturegofgthegmantlegisgcompletel
opglayergofgthegoceansgingmostgcases,gAgandg ygunderstood.
Bglayersgbeinggpracticallygabsentgfromgthere. a) True
b) False
10. Thegleastgdenseglayergamonggtheglayersg ViewgAnswer
undergthegcontinentalgcrustgisg Answer:gb
a) A-layer Explanation:gItgisgsaidgthatgthegexactgnaturegof
b) B-layer gthegmantlegisgasgyetgincompletelygunderstood
c) C-layer .
d) D-layer
ViewgAnswer 4. Whichgofgthegfollowinggisgnotgtruegabou
tgAsthenosphere?
Answer:ga
a) Itgisgpresentgingtheguppergmantle
Explanation:gThegAgorgthegupperglayergisgbetw
b) Itgisgingsolidgstate
eeng2gtog10gkmgthickgandgisgofglowgdensity,
c) Itgisgthegsourcegofgvolcanicgactivity
2.00gg/cc.
d) Itgisgingplasticgrathergthangsolidgstate
11. Thegareagnotgconsideredgundergthegcrustgis ViewgAnswer
Answer:gb
a) Mountainousgarea Explanation:gItgisgingsolidgstategisgnotgtruegandg
b) Continentalgarea thegremaininggoptionsgaregtruegandgtheygaregc
c) Oceanicgarea haracteristicsgofgthegasthenosphere.gIngGreek,g
d) Glacialgarea “asthenes”gmeansgwithoutgstrengthgandghence
ViewgAnswer gthegname.
Answer:gd
Explanation:gThegfirstgthegoptions,gMountaino 5. Whogwasgthegfirstgpersongtogtellgaboutgth
us,gContinentalgandgOceanicgareasgaregstudie egCore?
dgseparatelygwhereasgGlacialgareagisgnotgcons a) GrahamgBell
ideredgundergstudygofgthegcrustgasgsuch. b) AlbertgEinstein
c) IsaacgNewton
1. Thegdepthgupgtogwhichgthegmantlegisgsaidgt d) R.D.gOldham
ogexistgisg ViewgAnswer
a) 2000gkm Answer:gd
b) 1500gkm Explanation:gThegexistencegofgthegcoregwasgs
c) 2900gkm uggestedgbygR.D.gOldhamging1906gandgsubse
d) 1800gkm quentlygconfirmedgbygothergseismologists.
ViewgAnswer
6. Thegdepthgatgwhichgthegcoreglayergstartsgan
Answer:gc
dgendsgrespectivelygisg
Explanation:gThegsecondglayer,gMantle,gliesgbe
a) 2900gandg6371gkm
neathgthegcrustgandgthisgzonegstartinggfromgthe
b) 2000gandg5371gkm
glowergboundarygofgthegcrustgcontinuesgupgtogag
c) 2500gandg4771gkm
depthgofg2,900gkm.
d) 2000gandg5000gkm
2. Thegthicknessgofgtheg2glayersgofgthegupper ViewgAnswer
gmantlegisgapproximatelygsaidgtogbeg Answer:ga
a) 400gandg600gkm Explanation:gThegmantlegextendsgupgtogthegde
b) 300gandg500gkm pthgofg2900gkmgandgfromgthatgdepthgitgisgthegc
c) 450gandg800gkm oregthatgisgsaidgtogbegpresentgandgthegradiusgof
d) 300gandg400gkm gthegEarthgisg6371gkm gandghencegthegcoregisgs
ViewgAnswer aidgtogextendgtillg6371gkm.
Answer:ga
7. Whichgofgthegfollowinggisgtruegaboutgtheginne
Explanation:gTheguppergmantlegisgfurther
rgcore?
3
g|gPg ag gg e
, a) Itgisgbelievedgtogbegagsemigsolidgbody g/ccgatgthegboundarygofgtheginnergcoregandgbec
b) Itgisgbelievedgtogbegagsolidgbody omesg13gg/ccgatgthegcentregofgthegEarth.
c) Itgisgbelievedgtogbegagliquidgbody
d) Itgisgbelievedgtogbegaggaseousgbody. 12. Theglayergwhichgisgsaidgtogsupportgthegslo
ViewgAnswer wgmovinggtectonicgplatesgisg
a) Asthenosphere
Answer:gb
Explanation:gTheginnergcoregwithgagthicknessgo b) Lithosphere
c) Mohorovicgsphere
fgaroundg1790gkmgisgbelievedgtogbegagsolidgbo
d) Coreglayer
dy.
ViewgAnswer
8. ThegdensitygofgthegEarthgingthegcoregi Answer:ga
mmediatelygaftergthegmantlegisg Explanation:gThegAsthenospheregisgbelievedgtog
a) 8gg/cc beglocatedgentirelygingtheguppergmantlegandgsup
b) 7.6gg/cc portsgthegslowlygmovinggtectonicgplates.
c) 9.9gg/cc
d) 8.7gg/cc 13. Whatgisgthegthicknessgofgtheginnergcore?
ViewgAnswer a) 790gkm
b) 1790gkm
Answer:gc
c) 2790gkm
Explanation:gAtgthegbasegofgthegmantle,gdensit
d) 3790gkm
ygisginferredgasg5.7gg/ccgthatgjumpsgtog9.9gg/c
ViewgAnswer
cgatgthegtopgofgthegcore.
Answer:gb
9. TheglayergwhichgdoesgnotgtransmitgthegS Explanation:gTheginnergcore,gisgbelievedgtogbe
-gwavesgisg gingsolidgmetallicgstategandgisgsaidghavegthickn
a) Outergcore essgofgaboutg1790gkm.
b) Crust
c) Mantle 14. Theglayergwhichgisgbelievedgtogbegth
d) Innergcore egsourcegofgvolcanicgactivitygisg
ViewgAnswer a) Innergcore
b) Outergcore
Answer:ga
c) Asthenosphere
Explanation:gThegoutergcoregbehavesgmoreglik
d) Mohorovicicglayer
egagliquidgbecausegthegS-
wavesgfromgthegearthquakegshocksgreachinggt ViewgAnswer
hisgzonegaregnotgtransmittedgthroughgthisgzone Answer:gc
gatgall.
Explanation:gThegasthenospheregisgbelievedgt
ogbegthegsourcegofgmuchgvolcanicgactivitygand
10. Theregisgaghypothesisgthatgtheginnergcoregi gmanygothergprocesses.gItgisgsaidgbegtoglocate
sgmadegupgchieflygofgirongandgnickel. dgcompletelygingtheguppergmantle.
a) True
b) False Atmosphere
ViewgAnswer
Answer:ga
Explanation:gAsgregardsgthegchemicalgcomposi 1. Whichgofgthegfollowinggaboutgweatheringgi
tiongofgtheginnergcore,gtheghypothesisgthatgitgisg sgnotgtrue?
madegupgchieflygofgirongandgnickelgelementsgh a) Itgisgagnaturalgprocess
asgfoundgsupportgfromgmanygaccounts. b) Mechanicalgdisintegrationgisginvolved
c) Chemicalgdecompositiongisginvolved
11. ThegdensitygofgthegEarthgatgitsgcentregisgsai d) Itgisgagrapidgprocess
dgtogbeg ViewgAnswer
a) 9.9gg/cc Answer:gd
b) 8.8gg/cc Explanation:gWeatheringgisgdefinedgas,gagnatu
c) 13gg/cc ralgprocessgofgin-
d) 12.7gg/cc
situgmechanicalgdisintegrationgandgorgchemic
ViewgAnswer
algdecompositiongofgthegrocksgofgthegcrustgofgt
Answer:gc hegEarthgbygcertain
4
g|gPg ag gg e
b) 50-60gkm
1. Whatgisgthegthicknessgofgthegcrustgundergth c) 70-80gkm
egmountainousgareasgandgingparticulargthegHi d) 30-40gkm
malayas? ViewgAnswer
a) 50-55gkm Answer:gd
b) 60-65gkm Explanation:gMohorovicicgdiscontinuitygfromgse
c) 70-75gkm ismicgevidencegisgdeterminedgthatgitgisgapproxi
d) 30-35gkm matelygatgagdepthgofg30-40gkm.
ViewgAnswer 6. WhatgisgthegspeedgattainedgbygthegP-
Answer:gc wavesgingthegC-
Explanation:gItgisgbelievedgthatgthegthicknessgo layergundergthegContinentalgcrust?
fgthegcrustgundergthegHimalayasgisg70gtog75gk a) 6gtog7.6gkm/sec
mgandgundergthegHindukushgitgisgsaidgtogbeg60 b) 3gtog4gkm/sec
gkm gthick.
c) 5gtog6.3gkm/sec
2. Thegdiscontinuitygwhichgmarksgtheglowe d) 1.8gtog2.5gkm/sec
rgboundarygofgthegcrustgisg ViewgAnswer
a) Crust-Mantlegdiscontinuity Answer:ga
b) Oceanicgdiscontinuity Explanation:gThegC-
c) SIALglayer layergisgtheglowermostglayergofgthegcontinental
d) Mohorovicicgdiscontinuity gcrustgandgheregthegP-
gwavesgattaingvelocitygasghighgasg6gtog7.6gkm/
ViewgAnswer
Answer:gd sec.
Explanation:gMohorovicicgdiscontinuitygmarksgt 7. Theglayergundergthegcontinentalgcrustgwit
heglowergboundarygofgthegcrustgwhichgisgthegfir hgthegdensitygofg2.4gtog2.6gg/ccgis?
stglayergofgthegEarth. a) A-layer
3. Theggraniteglayergingthegcrustgisgalsogreferre b) B-layer
dgtogasg c) C-layer
a) SIAL d) D-layer
b) SIMA ViewgAnswer
c) SLAM Answer:gb
d) SILA Explanation:gThegMiddleglayergorgB-
ViewgAnswer layergofgthegcontinentalgcrustgisgrelativelygdens
Answer:ga egcomparedgtogA-
Explanation:gSIALgstandsgforgSilicongandgAlu layergandgthegdensitygisgsaidgtogbeg2.4gto
miniumgandgasgpergthegnamegitgisgmadegupgofg 2.6gg/cc.
thegtwogelementsgandghencegthegname. 8. ThegexpansiongofgSIMAgisg
4. Thegdensitygofgthegoceanicglayergingthegcru a) SilicongandgManganese
stgisgsaidgtogbeg b) SilicongandgMagnesium
a) 3.00gg/cc c) StrontiumgandgManganese
b) 2.50gg/cc d) StrontiumgandgMagnesium
c) 1.90gg/cc ViewgAnswer
d) 2.00gg/cc Answer:gb
ViewgAnswer Explanation:gSilicongandgMagnesium.gThegC-
Answer:ga glayergundergthegcontinentalgcrustgisgrichgingSili
Explanation:gThegoceanicgcrustgisgestimatedgt congandgMagnesiumgandghencegtheglayergisgal
oghavegagvolumegofg2.54*109gccgwithgangaver sogsometimesgcalledgSIMA.
agegdensitygofg3.00gg/cc. 9. ThegoceanicglayergisgthegextensiongofgC-
5. ThegdepthgatgwhichgthegMohorovici layergofgthegcontinentalgcrustgandgAgandgB-
cgdiscontinuitygoccursgisg layergaregmostlygabsent.
a) True
1
g|gPg ag gg e
,b) False
ViewgAnswer
2
g|gPg ag gg e
,Answer:ga dividedgintogtwoglayersgofg400gandg600gkmgthic
Explanation:gThegoceanicgcrustgisgthegextensi knessgrespectively.
ongofgC-
layergofgthegcontinentalgcrustgthatgmakesgthegt 3. Thegexactgnaturegofgthegmantlegisgcompletel
opglayergofgthegoceansgingmostgcases,gAgandg ygunderstood.
Bglayersgbeinggpracticallygabsentgfromgthere. a) True
b) False
10. Thegleastgdenseglayergamonggtheglayersg ViewgAnswer
undergthegcontinentalgcrustgisg Answer:gb
a) A-layer Explanation:gItgisgsaidgthatgthegexactgnaturegof
b) B-layer gthegmantlegisgasgyetgincompletelygunderstood
c) C-layer .
d) D-layer
ViewgAnswer 4. Whichgofgthegfollowinggisgnotgtruegabou
tgAsthenosphere?
Answer:ga
a) Itgisgpresentgingtheguppergmantle
Explanation:gThegAgorgthegupperglayergisgbetw
b) Itgisgingsolidgstate
eeng2gtog10gkmgthickgandgisgofglowgdensity,
c) Itgisgthegsourcegofgvolcanicgactivity
2.00gg/cc.
d) Itgisgingplasticgrathergthangsolidgstate
11. Thegareagnotgconsideredgundergthegcrustgis ViewgAnswer
Answer:gb
a) Mountainousgarea Explanation:gItgisgingsolidgstategisgnotgtruegandg
b) Continentalgarea thegremaininggoptionsgaregtruegandgtheygaregc
c) Oceanicgarea haracteristicsgofgthegasthenosphere.gIngGreek,g
d) Glacialgarea “asthenes”gmeansgwithoutgstrengthgandghence
ViewgAnswer gthegname.
Answer:gd
Explanation:gThegfirstgthegoptions,gMountaino 5. Whogwasgthegfirstgpersongtogtellgaboutgth
us,gContinentalgandgOceanicgareasgaregstudie egCore?
dgseparatelygwhereasgGlacialgareagisgnotgcons a) GrahamgBell
ideredgundergstudygofgthegcrustgasgsuch. b) AlbertgEinstein
c) IsaacgNewton
1. Thegdepthgupgtogwhichgthegmantlegisgsaidgt d) R.D.gOldham
ogexistgisg ViewgAnswer
a) 2000gkm Answer:gd
b) 1500gkm Explanation:gThegexistencegofgthegcoregwasgs
c) 2900gkm uggestedgbygR.D.gOldhamging1906gandgsubse
d) 1800gkm quentlygconfirmedgbygothergseismologists.
ViewgAnswer
6. Thegdepthgatgwhichgthegcoreglayergstartsgan
Answer:gc
dgendsgrespectivelygisg
Explanation:gThegsecondglayer,gMantle,gliesgbe
a) 2900gandg6371gkm
neathgthegcrustgandgthisgzonegstartinggfromgthe
b) 2000gandg5371gkm
glowergboundarygofgthegcrustgcontinuesgupgtogag
c) 2500gandg4771gkm
depthgofg2,900gkm.
d) 2000gandg5000gkm
2. Thegthicknessgofgtheg2glayersgofgthegupper ViewgAnswer
gmantlegisgapproximatelygsaidgtogbeg Answer:ga
a) 400gandg600gkm Explanation:gThegmantlegextendsgupgtogthegde
b) 300gandg500gkm pthgofg2900gkmgandgfromgthatgdepthgitgisgthegc
c) 450gandg800gkm oregthatgisgsaidgtogbegpresentgandgthegradiusgof
d) 300gandg400gkm gthegEarthgisg6371gkm gandghencegthegcoregisgs
ViewgAnswer aidgtogextendgtillg6371gkm.
Answer:ga
7. Whichgofgthegfollowinggisgtruegaboutgtheginne
Explanation:gTheguppergmantlegisgfurther
rgcore?
3
g|gPg ag gg e
, a) Itgisgbelievedgtogbegagsemigsolidgbody g/ccgatgthegboundarygofgtheginnergcoregandgbec
b) Itgisgbelievedgtogbegagsolidgbody omesg13gg/ccgatgthegcentregofgthegEarth.
c) Itgisgbelievedgtogbegagliquidgbody
d) Itgisgbelievedgtogbegaggaseousgbody. 12. Theglayergwhichgisgsaidgtogsupportgthegslo
ViewgAnswer wgmovinggtectonicgplatesgisg
a) Asthenosphere
Answer:gb
Explanation:gTheginnergcoregwithgagthicknessgo b) Lithosphere
c) Mohorovicgsphere
fgaroundg1790gkmgisgbelievedgtogbegagsolidgbo
d) Coreglayer
dy.
ViewgAnswer
8. ThegdensitygofgthegEarthgingthegcoregi Answer:ga
mmediatelygaftergthegmantlegisg Explanation:gThegAsthenospheregisgbelievedgtog
a) 8gg/cc beglocatedgentirelygingtheguppergmantlegandgsup
b) 7.6gg/cc portsgthegslowlygmovinggtectonicgplates.
c) 9.9gg/cc
d) 8.7gg/cc 13. Whatgisgthegthicknessgofgtheginnergcore?
ViewgAnswer a) 790gkm
b) 1790gkm
Answer:gc
c) 2790gkm
Explanation:gAtgthegbasegofgthegmantle,gdensit
d) 3790gkm
ygisginferredgasg5.7gg/ccgthatgjumpsgtog9.9gg/c
ViewgAnswer
cgatgthegtopgofgthegcore.
Answer:gb
9. TheglayergwhichgdoesgnotgtransmitgthegS Explanation:gTheginnergcore,gisgbelievedgtogbe
-gwavesgisg gingsolidgmetallicgstategandgisgsaidghavegthickn
a) Outergcore essgofgaboutg1790gkm.
b) Crust
c) Mantle 14. Theglayergwhichgisgbelievedgtogbegth
d) Innergcore egsourcegofgvolcanicgactivitygisg
ViewgAnswer a) Innergcore
b) Outergcore
Answer:ga
c) Asthenosphere
Explanation:gThegoutergcoregbehavesgmoreglik
d) Mohorovicicglayer
egagliquidgbecausegthegS-
wavesgfromgthegearthquakegshocksgreachinggt ViewgAnswer
hisgzonegaregnotgtransmittedgthroughgthisgzone Answer:gc
gatgall.
Explanation:gThegasthenospheregisgbelievedgt
ogbegthegsourcegofgmuchgvolcanicgactivitygand
10. Theregisgaghypothesisgthatgtheginnergcoregi gmanygothergprocesses.gItgisgsaidgbegtoglocate
sgmadegupgchieflygofgirongandgnickel. dgcompletelygingtheguppergmantle.
a) True
b) False Atmosphere
ViewgAnswer
Answer:ga
Explanation:gAsgregardsgthegchemicalgcomposi 1. Whichgofgthegfollowinggaboutgweatheringgi
tiongofgtheginnergcore,gtheghypothesisgthatgitgisg sgnotgtrue?
madegupgchieflygofgirongandgnickelgelementsgh a) Itgisgagnaturalgprocess
asgfoundgsupportgfromgmanygaccounts. b) Mechanicalgdisintegrationgisginvolved
c) Chemicalgdecompositiongisginvolved
11. ThegdensitygofgthegEarthgatgitsgcentregisgsai d) Itgisgagrapidgprocess
dgtogbeg ViewgAnswer
a) 9.9gg/cc Answer:gd
b) 8.8gg/cc Explanation:gWeatheringgisgdefinedgas,gagnatu
c) 13gg/cc ralgprocessgofgin-
d) 12.7gg/cc
situgmechanicalgdisintegrationgandgorgchemic
ViewgAnswer
algdecompositiongofgthegrocksgofgthegcrustgofgt
Answer:gc hegEarthgbygcertain
4
g|gPg ag gg e
