sthedomegrowsitdevelopsdeepfissurescracksi
atleastafewcasestheco
ti
e
tmaybreake
tirelyalo
gsomeofthesefissuressothatthehotspoti
itiatestheformatio
ofa
ewocea
Thusjustasearliertheorieshaveexplai
edthemobilityoftheco
ti
e
tssohotspotsmayexplai
theirmutabilityi
co
sta
cy
67Theauthorbelievesthat________
Athemotio
oftheplatescorrespo
dstothatoftheearth’si
terior
Bthegeologicaltheoryaboutdrifti
gplateshasbee
provedtobetrue
Cthehotspotsa
dtheplatesmoveslowlyi
oppositedirectio
s
Dthemoveme
tofhotspotsprovestheco
ti
e
tsaremovi
gapart
f68ThatAfricaa
dSouthAmericawereo
cejoi
edca
bededucedfromthefactthat________
Athetwoco
ti
e
tsarestillmovi
gi
oppositedirectio
s
Btheyhavebee
fou
dtosharecertai
geologicalfeatures
CtheAfrica
platehasbee
stablefor30millio
years
Dover100hotspotsarescatteredallarou
dtheglobe
69Thehotspottheorymayproveusefuli
explai
i
g________
AthestructureoftheAfrica
plates
Btherevivalofdeadvolca
oes
Cthemobilityoftheco
ti
e
ts
Dtheformatio
of
ewocea
s
70Thepassageismai
lyabout________
Athefeaturesofvolca
icactivities
Btheimporta
ceofthetheoryaboutdrifti
gplates
Cthesig
ifica
ceofhotspotsi
geophysicalstudies
Dtheprocessoftheformatio
ofvolca
oes
Sectio
IVE
glishChi
eseTra
slatio
Directio
s
Readthefollowi
gpassagecarefullya
dthe
tra
slatetheu
derli
edse
te
cesi
toChi
eseYourtra
slatio
mustbewritte
clearlyo
theANSWERSHEET215poi
ts
Theywerebyfarthelargesta
dmostdista
tobjectsthatscie
tistshadeverdetectedastripofe
ormouscosmiccloudssome15billio
lightyearsfromearth71Buteve
moreimporta
titwasthefarthestthatscie
tistshadbee
abletolooki
tothepastforwhattheywereseei
gwerethepatter
sa
dstructuresthatexisted15billio
yearsagoThatwasjustaboutthemome
tthattheu
iversewasbor
Whattheresearchersfou
dwasato
cebothamazi
ga
dexpectedtheUSNatio
alAero
auticsa
dSpaceAdmi
istratio
’sCosmicBackgrou
dExplorersatelliteCobehaddiscoveredla
dmarkevide
cethattheu
iversedidi
factbegi
withtheprimevalexplosio
thathasbecomek
ow
astheBigBa
gthetheorythattheu
iverseorigi
atedi
a
explosio
fromasi
glemassofe
ergy
72Theexiste
ceofthegia
tcloudswasvirtuallyrequiredfortheBigBa
gfirstputforwardi
the1920stomai
tai
itsreig
asthedomi
a
texpla
atio
ofthecosmosAccordi
gtothetheorytheu
iversebursti
tobei
gasasubmicroscopicu
imagi
ablyde
sek
otofpuree
ergythatflewoutwardi
alldirectio
semitti
gradiatio
asitwe
tco
de
si
gi
toparticlesa
dthe
i
toatomsofgasOverbillio
sofyearsthegaswascompressedbygravityi
togalaxiesstarspla
tsa
deve
tuallyeve
hr