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But this is not always the case. Have a look at the following:

b) Which country’s population pyramid differs the most from Germany’s?

Male Female Male
USA 95 100
Japan 94 100
Germany 91 100
China 100 106
India 100 107

Activity 3:

To represent the differences in particular populations in pyramids

[lo 3.2]

  • When births and deaths follow their natural course in any community, and if there is no marked increase or decrease in numbers due to migration, the population structure is reflected as a “normal” pyramid, as in Figure 1. By now you already know it.

Within these normal communities with their “normal” pyramids, it might happen that cultural, social and economic factors change the composition of the population regarding age groups and gender. In this event the shape of a pyramid representing a particular community will begin to deviate from the norm. If a few thousand Turks leave Turkey annually to go and work in the city of Munich, the population structure of the Turkish territory, as well as that of Munich, will also change in due course.

  1. The pyramid for communities with a high birth rate , high death rate and a short life expectancy , will still be shaped like a “normal” pyramid, but the top will be lower and the pyramid will show marked indentations on the sides.

b) The pyramids for communities and populations with a low birth rate , an equally low death rate and a long life expectancy (an affluent society enjoying a good quality of life and medical care), will have a relatively narrow basis (narrower than the one above), gradually sloping towards the top.

  1. Only primitive communities (those in an early stage of development) have a high birth rate as well as a high death rate (the birth rate being the highest). This results in a rather rapid growth in the population
  1. The populations of developed countries (e.g. most of the Western European states) have a low birth and death rate . In some instances the birth rate is even lower than the death rate, resulting in a negative population growth. The life expectancy is high. In this case we refer to an “old” population.

Please note: The percentages on the horizontal lines are not the same for the four pyramids.

4. Why do changes in population occur?

In the long history of the world, most changes that took place related to growth only. Human beings simply continued to increase all over the earth. But this no longer holds true for all parts of the world. In some European countries the population is in fact shrinking (decreasing, becoming smaller).

And if you were under the impression that only (very) rapid growth in certain countries or areas cause problems, you’ll have to think again, for a decrease in the population can be equally problematic! In these instances people only have to cope with a different set of problems.

But before we pay attention to the effects and challenges of change, we have to establish why these changes occur in the first place.

Although it has already been said that some countries experience a decrease in their population, the major changes are mainly due to population increase. On the whole, the world population is actually growing .

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Geography grade 7. OpenStax CNX. Sep 09, 2009 Download for free at http://cnx.org/content/col11021/1.1
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