cameroon gce A level June 2024 geology 1

cameroon gce A level June 2024 geology 1

cameroon gce A level June 2024 geology 1

A Planetary bodies
B Comets
C Satellites
D Asteroids

2. The planet with the highest surface temperature
They are the most destructive earthquake waves:
A P-waves
B L-vvaves
C S-vvaves
‘D PandS-waves
is: 7.
•
•< A Venus B Earth C Mars D Mercury Below is a diagram ( Figure 1) showing the Earth’s internal structure. Use it to answer questions 3, 4 and 5. If a body wave is travelling at lOkm/s, how Iona will it take to reach the Gutenberg’s discontinuity? A 5 minutes B 8 minutes C 3 minutes . * D . 11 minutes 8. * ‘ . > :

, Study the crystal drawing below (Figure 2) and
answer questions 9, 10 and 11.
– ^

Figure 1
Which reason below accounts for the solid
nature of layer R?
A Presence of nickel and iron.
B Crystallization of iron due to high
pressure.
C High density of the rocks.
D Presence of solid rocks.
3.
Figure 2
How many diagonal planes does the above
crystal possess?
A Four
B Three
C Seven
D Six
9
What name is given to layer P?
A Crust
B Oceanic crust
C Lower Mantle
D Outer core

10. What is the Miller index of the face labelled Y?
A
1011
f
Which seismic property below best accounts
for the physical state of layer Q?
A The transmission of p-waves.
B Increase in the velocity of both P and Swaves.
C The refraction of S-waves.
D Increase in velocity of both P and Swaves.
5. B
1101
c oil!
D loll
Ihe most appropriate nameofthe formshownb)
the crystal above is ;.
k ‘ ‘
A Hexagqnal bipyramid.
B Bipyramid of second order.
C Hexagonal bipyramid of first order.
D 1lexagonal prism of the second order.

The diagrams below (Figure 3) represent
structures of some silicate minerals. Study and
answer questions 12,13 and 14 below.
What is the colour index of a rock which has
composition Y ?
A 50-30
B 60-90
C 90-100
D 0-100
15.
A,
..
^ A. A _ A
^7 W V The volcanic igneous rocks represented by the
letters X and Z respectively are:
* • {
A Andesite and Basalt
B Trachyte and Obsidian
C Pitchstone and Andesite
D Rhyolite and Basalt
Structure N 16.
XX7 X
Structure M
Figure 3
A mineral that possess the structure labelled N is:
A Augite
Hornblende
C Biolite
D Olivine
17. Which of the following rock types represented by
the letters W, X, Y and Z would be the last to
crystallize from a primary magma?
A Y
B X
C W
D Z
12
B
13. The silicon-oxygen ratio of the structure labelled
M is : . .
A 2:5 . .
B 4:11
C 2:7
D 1:4
18. A metamorphic rock rich in garnet and pyroxene
formed at extremely high pressure and
temperature around mountain belts is:
A Eclogite .
B : Amphibolite
C Granulite
D Hornfels
14. What is the difference between structures
M and N ?
A Structure M has separate Si04 tetrahedra
while structure N is linked.
B Structure M has a sheet structure while
structure N has a chain structure.
C In M, each tetrahedron shares two and
three oxygen atoms while in N only two
oxygen atoms are shared.
D In structure M, each tetrahedron is linked
by Fe2’ and Mg2 * while in N each
tetrahedron shares three atoms with its
neighbours.
i i > ‘
i
Hornfels, a non-foliated metamorphic rock has
the following textures:
A Porphyroblastic and equidimensional
B Xenoblastic and inequidimensional
C Granoblastic and equidimensional
D Idioblastic and equigranular
19.
20. An index mineral formed at the highest
metamorphic grade is:
A Chlorite
B Sillimanite
C Biotite
D Garnet
t
Study Table 1 below which shows the chemical
composition of the main groups of igneous rocks
and answer questions 15, 16 and 17

• Paper 2