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8/2/2019 Geology 05 Mark-Scheme
1/5
MARKING SCHEMES
SUMMER2005
GEOLOGY.
PAPER 1
HIGHER TIER
Question Response Mark Sub
Mark
Total
1 a (i)
(ii)
(iii)(iv)
b (i)
(ii)
(iii)
(iv)
c (i)
(ii)
d
65 ma
325/65 = 5km per ma = 5mm per yeartransform (accept wrench or tear)
6.7
movement on faults/movement on San Andreas Fault
P wave
L wave
Highest amplitude/greatest vibrations or similar
Correct plotting
Collision of plates(1) subduction (1) of ocean crust (1)
friction between plates (1)Any 2 points
Destruction of buildings (1), death by burial/crushing (1),
outbreak of fire (1), loss of services (electricity, gas,
water, phone) (2)
destruction of infrastructure (roads, bridges, railways/
hospitals (1) disease (1) Any 3
1
1
11
1
1
1
1
1
2
2
3
4
5
4
3 16
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2 a (i)
(ii)
(iii)
(iv)
b
Allow between 12 15 mm
sedimentary
D C E ( one correct 1)
Foliated or similar description (1) fragmental (accept
rounded) (1)
1 (1)
crystals foliated therefore formed under pressure (1)
medium/coarse grained high temperatures (1)
mineral composition medium grade (1)
regional metamorphism (1)
Give marks for explanation not description
1
1
2
2
4
6
4 10
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Question Response Mark Sub
Mark
Total
3 a (i)
(ii)
b
Plot of data
1 F 2 G
Grain size gets smaller/finer at the sea (1), grain shape
gets more rounded/rounded at the sea (1), due to
attrition/collision of grains (1), due to corrasion/rubbing
against river bed (1), fragments broken off (1)
Description max 2 explanation max 2 diagrams 2
2
2
6
4
6 10
4 a
b
c (i)(ii)
(iii)
d
Constructive plate margin/divergent plate margin
narrow base
steep slope
effusive
andesitic /acidic
High silica content increases viscosity (1), high viscosity
prevents escape of gas (1), andesitic high viscosity and
explosive (1), andesitic high silica and high viscosity,
andesitic lava and pyroclastics block the vent and trap gas
(1) (or reverse of argument for basalt)
Any 3 pointsPlot of data
Heavy/coarse particles fall to earth near the vent (1),
smaller/lighter particles carried further by the wind (1),
most of the material is too heavy/large to be carried by the
wind
Any 2 points
Loose ash and mud mix to form mud flow (1), flows
down valleys (1), destroys property (1), risk of drowning
(1)
Any 2
Partial melting (1), of mantle (1),beneath ocean ridge / mantle plume (1)
Any 2 points
1
1
1
1
1
3
2
2
2
2
5
3
6
2 16
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Question Response Mark Sub
Mark
Total
5 a (i)
(ii)
(iii)(iv)
(v)
b
M 2 (1) N many (1)
Planes of symmetry on M and N
L coral (1) M brachiopod (1)Hard upper surface lived on bottom (1) legs
crawler/walking (1)
Absence of eyes burrower/deep water (1), spines for
digging/protection against predators (1)
Either carbonisation (1), loss of volatiles (1), enrichment
in carbon (1)
Cast (1), hollow stem (1), filled with sediment (1)
Name (1) description (1)
Or coalabundant plant material - terrestrial (1) swamp
(1) plant roots in situ (1) fossil soil (1), shale scattered
plant fragments - water currents (1)Any 4 points for interpretation not description from
diagram
2
2
22
2
4
4
10
4
4 14
6 a (i)
(ii)
(iii)
(iv)
(v)
b (i)(ii)
(iii)
c
Correct position of fold axis
Correct diagram with way up arrow
unconformity
oolitic limestone (1), underneath (1)
dolerite and/or coarse sandstone (1), pebbles in
conglomerate (1)
700ma
300ma
1:1 or 50:50
relative to other rocks (1) absolute is age in millions of
years (1)
1
1
2
1
4
11
1
2
9
3
2 14
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Question Response Mark Sub
Mark
Total
7 a (i)
(ii)
(iii)(iv)
b (i)
(ii)
c
2.5 3.5 (1), SiO2 (1), chalcopyrite (1)
R
looks like a metal (1) reflects light (1)Q R P
2
diluted further from vein (1)
Either from a granite(1) magma (1), water concentrated
(1) in late stage of cooling (1) elements (minerals)
dissolved in fluid (1) explosively released into country
rock (1) fractures country rock (1) fluid enters veins(1)
cools (1)precipitates (1)
Alternatively groundwater (1)heated by proximity of
granite (1) or deep burial(1)convects (1)rises and cools
(1)in veins/joints/ faults(1) precipitates (1)Any 4 points
Or analysis of stream sediment (1), insoluble elements
(1), more concentrated near deposit (1)
Analysis of soil (1), reveals hidden ore body (1), more
concentrated near ore body and dispersed away (1)
Gravity (1) detects anomalies (1)detects rocks associated
with mineral ores (1), e.g. granite/gabbro
Magnetic (1) detects anomalies (1), detects rocks
associated with mineral ores (1) e.g. gabbro (1)
Seismic (1) detects suitable structures (faults) (1)
Two methods, 2 marks each
3
1
22
1
1
4
4
8
2
4
4 14
8 a
b
c
d
Correct position of water table
Water passes through sandstone (1), stops at impermeable
shale (1), lubricates boundary (1), overlying sandstone
slides (1)
Any 2 points
South (1), steep dip (1), towards reservoir (1)
Any 2 points
Surge of water over dam (1), dam failure (1), flooding
downstream (1)
Any point
1
2
2
1
1
2
2
1 6
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