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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

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
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
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
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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