9
Pyramid graphs can also give us information about population growth.
2
Write true or false. Correct the false sentences.
a)
Pyramid graphs are used to show age groups.
c)
They don’t tell us about gender differences.
b)
They are always pyramid-shaped.
d)
They also tell us about changes in population.
3
5
Listen and say which pyramid graph is described.
a)
100+
90-99
80-89
70-79
60-69
50-59
40-49
30-39
20-29
10-19
0-9
2.0 1.5 1.0 0.5 0
(million)
0 0.5 1.0 1.5 2.0
(million)
Age group
Male
Female
b)
100+
90-99
80-89
70-79
60-69
50-59
40-49
30-39
20-29
10-19
0-9
2.0 1.5 1.0 0.5 0
(million)
0 0.5 1.0 1.5 2.0
(million)
Age group
Male
Female
4
T
h
i
n
k
!
Compare the pyramid graphs in activity 3.
a)
In graph a), which age groups have the highest number of people?
b)
In graph b), which age groups have the highest number of people?
c)
Which graph shows an increasing population? How do you know?
5
6
QUIZ
Check your learning.
A
C T I V I T I E S
Wider at the base: the
population is
increasing
because there aremore young
people than older people.
Wider in the middle: this tells
us that the population grew
rapidly in the past, but is
now
decreasing
.
Wider at the top: this tells
us that the population is
decreasing
, and has been
decreasing for many years.
100+
90-99
80-89
70-79
60-69
50-59
40-49
30-39
20-29
10-19
0-9
2.0 1.5 1.0 0.5 0
(million)
0 0.5 1.0 1.5 2.0
(million)
Age group
Male
Female
100+
90-99
80-89
70-79
60-69
50-59
40-49
30-39
20-29
10-19
0-9
2.0 1.5 1.0 0.5 0
(million)
0 0.5 1.0 1.5 2.0
(million)
Age group
Male
Female
100+
90-99
80-89
70-79
60-69
50-59
40-49
30-39
20-29
10-19
0-9
2.0 1.5 1.0 0.5 0
(million)
0 0.5 1.0 1.5 2.0
(million)
Age group
Male
Female
