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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

where we get a research paper on Nano chemistry....?
Maira Reply
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
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
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
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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