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Social sciences: geography

Grade 7

Population growth and changes

Module 6

The factors that influence growth and change

1. Definitions (to ensure that we all understand exactly what we read)

  • The word demography refers to a statistic description of the population (the number of people living in a specific area). The word is of Greek origin, in which demos refers to the people , and graphy to description .

Demographers don’t guess – they calculate! They use scientific knowledge to predict the possible effects and outcomes of population density.

Demography is an important field of study, as future planning often depends on whether the population is on the increase or on the decrease. To make a sound decision about e.g. where a dam is to be built, and when, the planners should seriously consider the population growth – the rate at which the population is either shrinking or growing. The planning of a new dam cannot wait until a particular area actually experiences a water shortage!

Similarly these planners might establish that a dam is not a good idea, for instance where the population is either decreasing, or remains constant.

Some of the important studies undertaken by demographers include determining the population of a country (or area) in relation to the future availability of resources such as water and the production of food and raw materials for industries (which also means work opportunities for the inhabitants). Demographic information is therefore an essential tool for planning the future.

Populations are subject to all kinds of changes that occur in the course of time. If the population consists mainly of young people, it is referred to as a young population. But a population could also “age”. When populations experience changes, usually from “young” to “old”, we speak of demographic change.

  • Statistics refers to the science or method of collecting data on mass phenomena (such as population, the country’s exports, etc.), and expressing it in numbers or figures.
  • The life expectancy of human beings refers to the average age that any particular person is likely to reach according to calculations. A baby born into a community with ample resources and good health care, has a higher life expectancy than that of a baby born in a poor country where health care hardly exists. The big difference in the number of older women as opposed to older men in any South African community, shows that women in South Africa (and in the rest of the world) enjoy a longer life expectancy than men.
  • Population could refer to the total number of inhabitants of any country, or that of only a small group, a city, an area, province or district. Groups (populations) can change in various ways, and change is in fact an ongoing process.
  • Urbanisation refers to the process where people move to cities and towns (as opposed to those remaining in rural areas where they live in a scattered fashion).
  • The use of a population pyramid is an easy way of depicting the population of any given area. The horizontal lines indicate the percentage of the population in the various age groups – divided into the two gender groups. The different age groups are stacked on top of each other. This makes it possible to obtain a very accurate total picture or image of the population at a glance.

Questions & Answers

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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
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.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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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