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Oxford Cambridge and RSA Examinations
GCE
Geology Advanced Subsidiary GCE
Unit F791: Global Tectonics
Mark Scheme for June 2012
OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to meet the needs of candidates of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas, GCSEs, OCR Nationals, Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration and secretarial skills. It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support, which keep pace with the changing needs of today’s society. This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which marks were awarded by examiners. It does not indicate the details of the discussions which took place at an examiners’ meeting before marking commenced. All examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes should be read in conjunction with the published question papers and the report on the examination. OCR will not enter into any discussion or correspondence in connection with this mark scheme. © OCR 2012 Any enquiries about publications should be addressed to: OCR Publications PO Box 5050 Annesley NOTTINGHAM NG15 0DL Telephone: 0870 770 6622 Facsimile: 01223 552610 E-mail: [email protected]
F79
1 M
ark
Sch
em
e Ju
ne
2012
1
An
no
tati
on
s
A
nn
ota
tio
n
Mea
nin
g
co
rrec
t res
pons
e
in
corr
ect r
espo
nse
be
nefit
of t
he d
oubt
be
nefit
of t
he d
oubt
no
t gi
ven
er
ror
carr
ied
forw
ard
in
form
atio
n om
itted
ig
nore
re
ject
Hig
hlig
htin
g is
als
o av
aila
ble
to h
ighl
ight
any
par
ticul
ar p
oint
s on
the
scrip
t.
F79
1 M
ark
Sch
em
e Ju
ne
2012
2
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
1
(a)
(i)
Con
serv
ativ
e
1
(ii)
San
And
reas
(F
ault)
/ st
rike
slip
/ tr
ansf
orm
1 A
LL
OW
Ha
ywar
d (F
ault)
or
any
othe
r co
rrec
tly n
amed
faul
t
(iii)
as
sho
wn,
Pac
ific
plat
e m
ovin
g N
W a
nd N
Am
eric
an p
late
mak
ing
SE
1 ne
ed t
wo
cor
rect
arr
ows
in c
orre
ct
dire
ctio
n A
LL
OW
bo
th a
rrow
s to
the
NW
but
ne
eds
a la
bel s
how
ing
Pac
ific
fast
er
than
the
Nor
th A
mer
ican
pla
te O
R
Pac
ific
arro
w la
rger
(iv)
(Nor
th)
Am
eric
an p
late
to th
e ea
st o
f the
faul
t P
acifi
c pl
ate
labe
lled
to th
e w
est o
f the
faul
t O
R a
nyw
here
in th
e oc
ean.
1 ne
ed b
oth
corr
ect f
or o
ne m
ark
as o
n th
e m
ap a
bove
(b
) (i)
(s
eism
ic)
tom
ogra
phy
1 D
O N
OT
AL
LO
W to
pogr
aphy
Pac
ific
plat
e N
orth
Am
eric
an p
late
F79
1 M
ark
Sch
em
e Ju
ne
2012
3
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
(ii
) (h
ot)
conv
ectio
n cu
rren
ts r
ise
OR
(ho
t) c
onve
ctio
n cu
rren
ts d
iver
ge O
R (
hot)
co
nvec
tion
curr
ents
pul
l pla
tes
apar
t OR
(ho
t) c
onve
ctio
n cu
rren
ts c
ause
di
verg
ent p
late
mar
gins
OR
rid
ge p
ush
push
es p
late
s ap
art
OR
ris
ing
mag
ma
push
es p
late
s ap
art
(col
d) c
onve
ctio
n cu
rren
ts c
onve
rge
and
sink
OR
(co
ld)
conv
ectio
n cu
rren
ts
caus
e co
nver
gent
pla
te m
argi
ns O
R s
lab
pull
mov
es p
late
s ap
art
AL
TE
RN
AT
IVE
AN
SW
ER
ho
t ris
ing
conv
ectio
n cu
rren
ts a
nd c
old
falli
ng c
onve
ctio
n cu
rren
ts
idea
of l
ithos
pher
e be
ing
mov
ed b
y th
e co
nvec
tion
curr
ents
OR
sla
b pu
ll an
d rid
ge p
ush
1
1
1 1
mar
k an
nota
ted
diag
ram
s as
text
if
men
tion
conv
ectio
n cu
rren
ts ju
st r
ise
and
sink
then
1 m
ark
ma
x lo
catio
n an
d ef
fect
= 1
(c
) (i)
ar
ea o
f the
man
tle w
hich
is e
xces
sive
ly h
ot O
R r
isin
g m
agm
a fr
om d
eep
in th
e m
antle
OR
mas
s of
mag
ma
risin
g th
roug
h th
e m
antle
1
acce
pt m
agm
a ris
ing
from
a s
peci
fic
dept
h in
the
man
tle b
etw
een
100
– 29
00 k
m
(ii
) vo
lcan
ic a
ctiv
ity a
t a fi
xed
poin
t OR
hot
spot
poi
nt a
bove
a m
antle
plu
me
OR
st
atio
nary
man
tle p
lum
e O
R e
rupt
ion
of la
va fo
rms
volc
anic
isla
nds
OR
vo
lcan
ic
activ
ity a
t a h
otsp
ot
plat
e m
oves
ove
r th
e m
ant
le p
lum
e O
R id
ea o
f isl
ands
mov
ing
away
fro
m th
e ho
tspo
t pro
duce
s a
line
of in
crea
sing
ly o
ld v
olca
noes
OR
sea
mou
nts
are
old
erod
ed v
olca
noes
OR
sea
mou
nts
are
sunk
en v
olca
nic
isla
nds
1 1
mar
k di
agra
ms
as te
xt
AL
LO
W a
nno
tatio
ns o
n m
ap
(d)
(i)
10 c
m/y
ear
+/-
0.8
cm
/yea
r co
rrec
t wor
king
di
stan
ce
510
km o
r 51
000
000
cm
t
ime
5.
1Ma
or
5 1
00 0
00 y
ears
1 1 If
470k
m th
en 9
.2
if 48
0km
then
9.4
if
490k
m th
en 9
.6
if 50
0km
then
9.8
if
510k
m th
en 1
0.0
if 52
0km
then
10.
2 if
530k
m th
en 1
0.4
if 54
0km
then
10.
6 if
550k
m th
en 1
0.8
F79
1 M
ark
Sch
em
e Ju
ne
2012
4
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
(ii
)
arro
w p
oint
ing
to N
W
1
(ii
i) ba
salt
1 A
LL
OW
ma
fic /
basi
c / b
asal
tic
To
tal
14
dire
ctio
n of
pl
ate
mov
em
ent
F79
1 M
ark
Sch
em
e Ju
ne
2012
5
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
2
(a)
(i)
colle
ctio
n of
sam
ples
of r
ock
/ soi
ls /
dust
OR
sam
ples
cou
ld b
e da
ted
OR
sa
mpl
es c
ould
be
anal
ysed
OR
sam
ples
com
posi
tion
dete
rmin
ed O
R s
how
ed
the
surf
ace
was
mad
e of
bas
alt O
R m
appe
d th
e cr
ater
s O
R e
vide
nce
of v
olca
nic
activ
ity
1 A
LL
OW
an
orth
osite
as
rock
type
(ii)
mar
ia O
R d
ark
area
da
rk a
rea
OR
(ba
salt)
lava
flow
s O
R lo
w ly
ing
flat a
reas
OR
cra
tere
d ar
ea
high
land
s O
R li
ght a
rea
light
col
oure
d O
R p
lagi
ocla
se r
ich
rock
OR
ano
rtho
site
OR
mou
ntai
nous
are
a
1 1
both
are
as n
amed
= 1
O
R c
orre
ct r
ock
in c
orre
ct a
rea
= 1
O
R n
am
e an
d de
scrip
tion
= 1
da
rk a
nd li
ght w
ith n
o na
me
then
1 m
ax
only
acc
ept d
ark
area
and
ligh
t are
a on
ce
(b)
(i)
aste
roid
bel
t 1
mus
t be
corr
ectly
spe
lt
(ii)
m
eteo
rite
type
m
eteo
rite
desc
riptio
n ca
rbon
aceo
us c
hond
rite
co
ntai
ns w
ater
and
org
anic
com
poun
ds
iron
co
mpo
sed
of a
met
allic
allo
y
ston
y
com
pose
d of
sili
cate
min
eral
s
-
2 1
OR
2 c
orre
ct =
1 m
ark
3
corr
ect =
2 m
arks
(c
)
man
tle
core
1 1
AC
CE
PT
ou
ter
or in
ner
core
T
ota
l8
F79
1 M
ark
Sch
em
e Ju
ne
2012
6
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
3
(a)
ov
erla
p du
e to
dep
ositi
on O
R o
verla
p du
e to
form
atio
n of
del
tas;
ga
p du
e to
ero
sion
; se
a le
vel c
hang
es;
fit is
at t
he e
dge
of th
e co
ntin
enta
l she
lf O
R 2
00 –
100
0 m
sub
mar
ine
cont
our
OR
at b
otto
m o
f con
tinen
tal s
lope
;
2 an
y 2
AC
CE
PT
du
e to
ero
sion
OR
dep
ositi
on
linke
d to
cha
nge
in s
hape
er
osio
n an
d de
posi
tion
with
no
deta
il =
1
max
(b)
cr
aton
s O
R s
hie
lds
OR
are
as o
f met
amor
phic
roc
ks fo
und
on b
oth
cont
inen
ts
mat
ch o
r jo
in u
p;
age
2000
– 1
000
Ma
OR
sam
e ag
e ro
cks
OR
Pre
cam
bria
n;
glac
ial d
epo
sits
OR
tilli
tes
foun
d on
bot
h co
ntin
ents
mat
ch o
r jo
in u
p;
300
- 35
0 M
a ro
cks
OR
sam
e ag
e O
R C
arbo
nife
rous
; sa
me
age
sequ
ence
of s
edim
enta
ry r
ocks
OR
lake
cla
ys O
R e
vapo
rites
OR
coa
l O
R d
eser
t san
dsto
nes
foun
d on
bot
h co
ntin
ents
mat
ch o
r jo
in u
p;
form
ed in
a d
iffer
ent c
limat
ic z
one
show
s m
ove
men
t;
2
Do
not a
war
d a
mar
k fo
r ju
st s
tatin
g th
ey
join
up
any
2 2
mar
ks m
ax
if tw
o ro
ck ty
pes
desc
ribed
1
mar
k m
ax
for
ages
A
CC
EP
T a
ny
othe
r re
ason
able
roc
k ty
pe
(c
)
sam
e tr
end
/ orie
ntat
ion
/ dire
ctio
n / a
lignm
ent /
pat
tern
of m
ount
ain
belts
acr
oss
the
join
of t
he c
ontin
ents
; st
ruct
ures
suc
h as
fold
s O
R fa
ults
mat
ch u
p;
sam
e ro
ck ty
pes
in th
e m
ount
ain
belt
mat
ch u
p fo
ld m
ount
ains
dra
wn
and
labe
lled
on th
e m
ap c
ontin
uous
ly o
n bo
th c
ontin
ents
1 1
any
1 m
ark
for
desc
riptio
n D
o no
t aw
ard
a m
ark
for
just
sta
ting
they
m
atch
or
join
up
1 m
ark
for
draw
ing
and
labe
lling
on
map
A
CC
EP
T a
ny
reas
onab
le a
rea
draw
n ov
er th
e jo
in
(d
)
dire
ctio
n of
str
iatio
ns s
how
s m
ove
men
t of i
ce O
R s
tria
tions
out
war
ds s
how
s m
ove
men
t fro
m ic
e ca
p;
1
any
1 m
ark
for
desc
riptio
n
F79
1 M
ark
Sch
em
e Ju
ne
2012
7
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
C
arbo
nife
rous
ice
shee
t acr
oss
Afr
ica
and
Sou
th A
mer
ica
OR
bot
h co
ntin
ents
w
ere
clos
er to
the
pole
; dr
awn
and
labe
lled
on th
e m
ap b
y a
rrow
s ra
diat
ing
out o
r po
intin
g w
est
1 1
mar
k fo
r dr
awin
g an
d la
belli
ng o
n m
ap
mus
t be
dra
wn
only
in s
outh
ern
part
s of
th
e tw
o co
ntin
ents
(e
)
Gon
dwan
alan
d 1
mus
t be
spel
led
corr
ectly
A
LL
OW
Gon
dwan
a
(f
) (i)
2 1
2 -
5 po
ints
cor
rect
= 1
mar
k 6
- 7
poin
ts c
orre
ct =
2 m
arks
1
mar
k fo
r cu
mul
ativ
e fr
eque
ncy
curv
e
(ii)
the
cont
inen
tal s
lope
labe
lled
from
just
bel
ow s
ea le
vel (
200m
) to
abo
ut 3
km
dept
h th
e ab
yssa
l pla
in la
belle
d fr
om 3
km –
6km
dep
th
1 1
as o
n th
e gr
aph
T
ota
l14
abys
sal
plai
n
cont
inen
tal s
lope
-
F79
1 M
ark
Sch
em
e Ju
ne
2012
8
Qu
esti
on
A
nsw
er
Mar
ks
Gu
idan
ce
4 (a
) (i)
sy
mm
etric
al s
ynfo
rm O
R s
ymm
etric
al s
yncl
ine
both
lim
bs d
ippi
ng a
t 40°
OR
with
a d
ip o
f 40°
bot
h si
des
fold
axi
s tr
endi
ng N
W -
SE
OR
fold
axi
al p
lane
trac
e tr
endi
ng N
W –
SE
;;
open
fold
; up
right
fold
axi
s;
1
1
for
nam
e A
LL
OW
1 m
ark
for
desc
riptio
n of
age
re
latio
nshi
ps
any
1
(ii)
co
mp
ress
ion
OR
com
pre
ssio
nal
1 D
O N
OT
AL
LO
W
com
pres
sive
(b
) (i)
st
rike
slip
OR
tear
faul
t si
nist
ral O
R le
ft la
tera
l; fa
ult t
rend
s N
E –
SW
;
1 1
AL
LO
W 1
mar
k fo
r de
scrip
tion
of a
ge
rela
tions
hips
an
y 1
(ii
) 51
m +
/- 1
8 m
1
this
ran
ge c
over
s m
easu
rem
ent
s us
ing
sand
ston
e or
igne
ous
rock
s an
d us
e of
all
poss
ible
di
visi
ons
of th
e sc
ale
(c
)
hors
t sho
ws
upth
row
n bl
ock
betw
een
2 fa
ults
gr
aben
sho
ws
dow
nthr
own
bloc
k be
twee
n 2
faul
ts
1 1
labe
ls c
ould
be
arro
ws
to
show
upt
hrow
and
do
wnt
hrow
th
e fa
ults
mus
t be
obvi
ous
show
ing
a cl
ear
disp
lace
men
t A
LL
OW
1 m
ark
ma
x fo
r tw
o co
rrec
t dia
gram
s w
ith n
o la
bels
fo
r 2
mar
ks n
eed
2/3
of
faul
ts, a
rrow
s or
mar
ker
bed
show
n fo
r 1
mar
k ne
ed 1
/3
norm
al
faul
ts
grab
en
ho
rst
F79
1 M
ark
Sch
em
e Ju
ne
2012
9
Qu
esti
on
A
nsw
er
Mar
ks
Gu
idan
ce
(d
) (i)
bo
th a
xial
pla
nes
mus
t be
draw
n an
d at
leas
t one
labe
lled
1 ax
ial p
lane
line
s m
ust e
xten
d th
roug
h a
min
imum
of t
hree
be
ds
(ii)
see
diag
ram
abo
ve
cres
t at t
op o
f ant
iform
tr
ough
at b
otto
m o
f syn
form
/ at
low
est p
oint
of t
he fo
ld
limb
on s
ides
of f
old
2
limb
in a
ny p
art o
f fol
d th
at is
no
t the
cre
st o
r tr
ough
1-
2 co
rrec
t =1
mar
k 3
corr
ect =
2 m
arks
(iii)
Wes
t 1
AL
LO
W le
ft
(iv)
over
fold
1
cres
t tr
ough
ax
ial p
lane
F79
1 M
ark
Sch
em
e Ju
ne
2012
10
Qu
esti
on
A
nsw
er
Mar
ksG
uid
ance
(e)
corr
ect s
hape
for
both
(ci
rcul
ar o
r ov
al)
= 1
ol
dest
and
you
nges
t cor
rect
for
both
= 1
at
leas
t 3 c
orre
ct d
ip a
rrow
dire
ctio
ns fo
r bo
th =
1
3
if a
cros
s se
ctio
n is
dra
wn
then
max
1 if
ant
iform
dra
wn
for
dom
e A
ND
syn
form
dr
awn
for
basi
n if
a 3D
dia
gram
is d
raw
n th
en m
ax 1
if d
ome
and
basi
n ar
e co
rrec
t
T
ota
l16
old
est
youn
gest
youn
gest
youn
gest
old
est
old
est
old
est
olde
st
F79
1 M
ark
Sch
em
e Ju
ne
2012
11
Qu
esti
on
A
nsw
er
Mar
ks
Gu
idan
ce
5
co
nve
rgen
t p
late
mar
gin
des
crip
tio
n
B
enio
ff zo
ne O
R li
near
zon
e of
ear
thqu
akes
par
alle
l to
the
plat
e m
argi
n O
R b
elow
fo
ld m
ount
ains
at c
ontin
enta
l – c
ontin
enta
l pla
te m
argi
n;
sh
allo
w fo
cus
(0-7
0km
) cl
ose
to th
e tr
ench
OR
at t
he to
p of
the
subd
uctio
n zo
ne O
R
inte
rmed
iate
and
dee
p fo
cus
furt
her
away
fro
m th
e tr
ench
(70
– 7
00km
) O
R s
hallo
w
to d
eep
(0-7
00km
) O
R s
hallo
w to
inte
rmed
iate
bel
ow c
ontin
enta
l – c
ontin
enta
l m
argi
n;
oc
curs
tow
ards
the
top
edge
of t
he s
ubdu
ctin
g pl
ate
OR
on
faul
ts b
elow
con
tinen
tal-
cont
inen
tal m
argi
n;
ca
n be
hig
h m
agni
tude
OR
infr
eque
nt;
2
co
nve
rgen
t p
late
mar
gin
exp
lan
atio
n
pr
oduc
ed b
y fr
ictio
n O
R m
ove
men
t of t
he s
ubdu
ctin
g pl
ate;
prod
uced
by
mov
em
ent
on r
ever
se fa
ults
OR
thru
sts;
form
ed b
y co
mpr
essi
onal
str
ess;
shal
low
ear
thqu
akes
pro
duce
d by
the
mov
em
ent
of m
agm
a;
diag
ram
to s
how
a c
onve
rgen
t pla
te m
argi
n;
2
acce
pt a
nnot
ated
dia
gram
s as
text
an
y 2
mar
ks fo
r th
e
desc
riptio
n
any
2 m
arks
for
the
expl
anat
ion
1
mar
k fo
r th
e la
belle
d di
agra
m m
ust
incl
ude
eart
hqua
kes
or B
enio
ff Z
one
max
5 m
arks
for
conv
erge
nt
mar
gins
d
iver
gen
t p
late
mar
gin
s d
escr
ipti
on
shal
low
focu
s (0
– 7
0km
);
oc
cur
alon
g th
e ed
ge o
f the
rift
OR
clo
se to
the
cent
re o
f the
MO
R O
R a
long
nor
mal
fa
ults
;
occu
r al
ong
tran
sfor
m fa
ults
;
freq
uent
OR
low
mag
nitu
de;
2
d
iver
gen
t p
late
mar
gin
s ex
pla
nat
ion
prod
uced
by
mov
em
ent
alon
g no
rmal
faul
ts O
R tr
ansf
orm
faul
ts;
ris
ing
mag
ma
caus
es s
mal
l ear
thqu
akes
;
diffe
rent
rat
es o
f sea
floo
r sp
read
ing
caus
es e
arth
quak
es;
fo
rmed
by
tens
iona
l str
ess;
OR
whe
re p
late
s m
ove
in o
ppos
ite d
irect
ions
di
agra
m to
sho
w a
div
erge
nt p
late
mar
gin.
2
acce
pt a
nnot
ated
dia
gram
s as
text
an
y 2
mar
ks fo
r th
e
desc
riptio
n
any
2 m
arks
for
the
expl
anat
ion
1
mar
k fo
r th
e la
belle
d di
agra
m m
ust
incl
ude
eart
hqua
kes
max
5 m
arks
for
dive
rgen
t m
argi
ns
T
ota
l8
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