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Figure 1 above represents a very “young” population. The vast majority are under 20 years of age, which also means that the population growth will be very high.

2. The population distribution across the globe

Activity 1:

To answer questions about the distribution of the world population

[lo 1.5]

  • The world population is not distributed evenly. Why not ? Study the world map [fig.2, population distribution] and other maps in your atlas, and answer the questions that follow

a) Why is the population so sparse at a , b and c ?

b) Why would the population at d and e be equally sparse?

c) Does the Amazon River in Brazil have anything to do with the population density in that country? (Explain)

d) Explain the reason for the densely populated area in the north-eastern corner of Africa.

e) Would you say that the whole of Australia has become urbanised?

The world population is not distributed evenly across the globe – in some parts the population is very high, while in others it is rather low. The reasons for this may vary from region to region, and from country to country. In the same way the population structures (with regard to e.g. age distribution) might also vary – one area would have an “old” population, while another would be regarded as “young”. Also, these characteristics of the population do not remain static – some regions could experience depopulation, while others might experience rapid urbanisation. In the same way a population could within 50 years possibly change from “young” to “old”. Could you think of any nearby town or village having either a “young” or “old” population? Why would that be? Has it already changed, or is it likely to change in any way, and why?

3. Population structures

This young population as depicted by means of the population pyramid in figure 1 on p. 5 was that of England and Wales in 1881. Fifty years later the picture looked quite different, and after a further fifty years it showed even more change. This type of change is called demographic development.

Important features of a population represented by means of a typical pyramid (having a broad basis), are (a) a high birth rate, (b) a high death rate, (c) short life expectancy.

The increase in the population of any group (a country or community) is calculated by means of the following formula:

Pg = b –d (+ or – net migration)

Pg is the P opulation g rowth

B is the B irth rate

M is the D eath rate

immigrants are added

emigrants are deducted

Activity 2:

To make inferences about population increase

[lo 3.2]

a) Is it possible that the Pg does not show an increase , but a decrease ? Motivate your answer.

3.1 Is the new baby going to be a male or female ( a boy or a girl)?

We take it for granted that an equal number of boys and girls are born in a big community or country . This means that in big, co-educational schools, one would usually find a more or less equal number of girls and boys. A drawing of the school’s “population pyramid” (watch out: it will not be shaped like a pyramid, but could you explain why?) would therefore be symmetrical .

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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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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