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Natuurwetenskappe

Graad 8

Biodiversiteit: aanpassings en oorlewing

Module 31

Die wêreldbevolking

In die vorige leereenheid het ons genoem dat die groei van die wêreldbevolking sal bepaal of volhoubare ontwikkeling moontlik is en dat ons deeglik hiervan bewus moet wees.

Aktiwiteit:

Om inligting oor wêreldbevolking te vertolk

  • Bestudeer die volgende tabel en bereken die natuurlike aanwas per eenheid.

WêRELDBEVOLKINGSGROEI

PER TYDEENHEID

TYDEENHEID GEBOORTES STERFTES NATUURLIKE GROEI
Jaar 131 468 233 54 147 021 ..................................................
Maand 10 955 686 4 512 252 ..................................................
Dag 360 187 148 348 ..................................................
Uur 15 008 6 181 ..................................................
Minuut 250 103 ..................................................
Sekondes 4,2 1,7 ..................................................
  • Op 12 Oktober 1999 het die wêreldbevolking die 6 BILJOEN merk bereik!!!

1. Wat is die nuutste waardes op die World POP clock?

2. Wat sal dit wees teen 2050?

3. Bestudeer die volgende tabel en teken ’n grafiek van die wêreldbevoking 1985 – 2006.

JAAR BEVOLKING (Biljoen)
1985 4.85
1986 4,93
1987 5,01
1988 5,10
1989 5,19
1990 5,22
1991 5,36
1992 5,44
1993 5,52
1994 5,60
1995 5,68
1996 5,76
1997 5,84
1998 5,92
1999 6,00
2000 6,08
2001 6,15
2002 6,23
2003 6,31
2004 6,38
2005 6,36
2006 6,53
  • Selfassessering: Merk die toepaslike blokkie indien voltooi:
Kriteria Merk indien voltooi
OPSKRIF
INTERVALLE KORREK
GRAFIEKVORM
EENHEDE EN BYSKRIFTE
POTLOODLYNE

Assessering van GRAFIEK: Kon jy ’n grafiek teken volgens die kriteria?

[LU 2.3; 3.1]

Aktiwiteit: OM NA TE DINK OOR DIE ROL WAT JY SPEEL IN DIE TOEKOMS VAN DIE AARDE

  • Skryf ’n paragraaf oor jou indrukke van die toekoms van die mens op planeet aarde en die rol wat jy kan speel.

Assessering van indrukke:

Het jy sinvolle indrukke oor die aarde se TOEKOMS neergeskryf?

[LU 3.1]

WHAT ARE WE DOING?

PLANET Earth is 4,600 million years old.

If we condense this inconceivable timespan into an understandable concept, we can liken the Earth to a person of 46 years of age.

Nothing is known of the first seven years of this person’s life.

Only scattered information exists about the middle span, but we know that only at the age of 42 did the Earth begin to flower.

Dinosaurs and the great reptiles did not appear until one year ago when the planet was 45.

Mammals arrived only eight months ago.

In the middle of last week, man-like apes evolved into ape-like men.

And at the weekend the last ice age enveloped the Earth.

Modern man has been around for only four hours.

During the last hour man discovered agriculture.

The industrial revolution began a minute ago, and during those 60 seconds of biological time, man has made a rubbish dump of paradise.

He has multiplied his numbers to plague proportions, caused the extinction of 500 species of animals, ransacked the Earth for fuels, and now stands like a brutish infant, gloating over his meteoric rise to acendancy, on the brink of a war to end all wars, and of effectively destroying this oasis of life in the solar system

( Greenpeace )

Assessering

LU 2

Wetenskaplike Kennis

Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Dit is bewys as die leerder:

2.1 sinvolle inligting kan onthou;

2.2 inligting in kategorieë kan plaas;

2.3 inligting kan interpreteer;

2.4 kennis kan toepas.

LU 3

Wetenskap, die Gemeenskap en die Omgewing

Die leerder is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon.

Dit is bewys as die leerder:

3.1 wetenskap as ‘n menslike aktiwiteit kan verstaan;

3.2 volhoubare gebruik van die aarde se hulpbronne verstaan.

Memorandum

Wêreldbevolking

  • Reël rekenaarsentrum-besoek of kry bronne vanaf internet vir leerders
  • Besoek die webtuiste www.census.gov:
  • Grafiekpapier vir oefening

ASSESSERINGRAAMWERK: Dra waardes oor

Questions & Answers

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
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
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
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
what's the program
Jordan
?
Jordan
what chemical
Jordan
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natuurwetenskappe graad 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
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