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Sosiale wetenskappe: aardrykskunde

Graad 7

Bevolkingsgroei en verandering

Module 6

Die faktore wat groei en verandering beïnvloed

Aktiwiteit 1:

Om vrae oor die verspreiding van die wêreldbevolking te beantwoord

[lu 1.5]

  • Die wêreldbevolking is nie eweredig versprei nie. Hoekom nie ? Bestudeer die wêreldkaart [fig. 2, bevolkingsverspreiding] en kaarte in jou atlas, en beantwoord die daaropvolgende vrae:

2. Die verspreiding van mense oor die wêreld

a) Om watter rede is daar ’n yl bevolking by a , b en c ?

b) Om watter rede is die bevolking by d en e ook besonder yl?

c) Het die Amasonerivier in Brasilië iets met die bevolkingsverspreiding in dié land te doen? (Verduidelik)

d) Verduidelik die oorsaak vir die bevolkingskonsentrasie in die noordoostelike hoek van Afrika.

e) Sou julle sê dat Australië in die geheel gesien verstedelik is?

3. Bevolkingstrukture

Die jong bevolking soos uitgebeeld met behulp van die bevolkingspiramide in figuur 1 was dié van Engeland en Wallis in 1881. Vyftig jaar later het die prentjie heelwat anders gelyk, en nog vyftig jaar later het dit verdere verandering ondergaan. Die verandering word demografiese oorgang genoem.

Belangrike kenmerke van ‘n bevolking wat met ‘n tipiese piramide (met ‘n breë basis) aangetoon word, is (a) hoë geboortesyfer, (b) hoë sterftesyfer, (c) kort lewensverwagting.

Die toename in bevolking van enige groep (‘n land of gemeenskap) word met die volgende formule bereken:

Bt = g – s (+ of – netto migrasie)

Bt is die B evolkings t oename

G is die G eboortesyfer

S is die S terftesyfer

immigrante word bygetel , en

emigrante word afgetrek

As die Bt ‘n relatief hoë syfer is, sal die bevolkingstruktuur as ‘n piramide met ‘n opvallend breë basis aangetoon word.

Migrasie geld nie net vir lande nie, maar ook vir bepaalde gemeenskappe binne lande.

Aktiwiteit 2:

Om ‘n afleiding wat betrekking het op bevolkingstoename te maak

[lu 3.2]

Is dit moontlik dat die Bt nie ‘n toename nie, maar ‘n afname kan beteken? Motiveer jou antwoord.

Aktiwiteit 3:

Om die verskille in bepaalde bevolkings in piramides voor te stel

[lu 3.2]

  • Wanneer geboortes en sterftes normaalweg voorkom in gemeenskappe, en mits daar nie groot getalle mense deur migrasie bykom of vertrek nie, sal die bevolkingstruktuur met ‘n taamlik “normale” piramide voorgestel kan word, soos Figuur 1. Julle weet dit al, maar stel julle net ‘n smaller basis voor.

Binne dié normale gemeenskappe met hul “normale” piramides kan kulturele, sosiale en ekonomiese faktore tot gevolg hê dat die samestelling ten opsigte van ouderdomsgroepe en die verteenwoordiging van die geslagte verander. Die vorm van die piramide waarmee die bepaalde gemeenskap dan voorgestel word, sal van die “normale” een begin afwyk. As daar jaarliks ‘n paar duisend jong Turkse mans uit ‘n deel van Turkye weggaan om in Duitsland, byvoorbeeld in die stad München, te gaan werk, sal die strukture van die Turkse streek sowel as dié van München mettertyd verander.

  1. Die piramide vir gemeenskappe met ‘n hoë geboortesyfer , hoë sterftesyfer en ‘n kort lewensverwagting , sal steeds ‘n “normale” piramidevorm hê, maar met ‘n laer bopunt en opvallende inkepings aan die kant.

Questions & Answers

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
what is biological synthesis of nanoparticles
Sanket 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, Aardrykskunde graad 7. OpenStax CNX. Sep 09, 2009 Download for free at http://cnx.org/content/col11020/1.1
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