FORMAL TASK
Level: Grade 9
Topic: Weathering
Subject: Geography
Time: 25 min
Examiner: M. Vilakati
Marks: 25
Name:
INSTRUCTION
Answer all questions within the spaces provided
1. Define the term weathering.
[2]
2. Describe the three main types of weathering.
[6]
3. Study the diagram below that illustrates the process of frost/ice
wedging.
Add labels and descriptions to A, B and C of the diagram to describe the
process of frost/ice wedging
A
B
C
[3]
4. Give one word that describes the repeated heating and cooling which
causes the rock to peel off.
[2]
1
5. Complete and fill in the missing information.
[6]
6. As humans we are great contributors to weathering. Study the
diagrams below and answer the questions that follow.
(a) What type of weathering is the exfoliation process?
[1]
(b) Explain what happens to the outer surface area of the rock in A and
B.
A
B
[2]
(b) Describe and explain what is happening with the surface of the rock
in C.
[2]
(c) What happens to the diameter and circumference of the rock in D
2
[1]
Column A
1.
Physical
weathering
2.
Biological
weathering
3. Oxidation
4. Freeze-thaw
5. Deposition
6. Erosion
7. Carbonation
8. Abrasion
9. Exfoliation
10. Hydrolysis
Column B
A. Happens to rocks that contain iron
B. Outer layers of rock peel off like onion skin
effect
C. Mechanical breakdown of rocks e.g.
exfoliation
D. weathered material is transported and laid
down
E. Wedging effect of tree roots
F. Chemical weathering
G. Movement of weathered material by agents
H. Hydrogen atoms in water react with minerals
in rock to form another mineral e.g. feldspar into
clay
I. Frozen water in natural rock crack causes the
rock to weaken and split into blocks
J. Transported rocks rub against each other and
break
3