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‘n Afbeelding van ‘n spoor van ‘n Apatosaurus wat in Engeland gevind is. Elke voetspoor van die dinosourus is omtrent een meter lank. Die stelle spore dui daarop dat hulle soms in troppe geloop het. Die drie-tonige voetspoor dui moontlik op ‘n vleisvretende dinosourus wat die Apatosaurus gejag het.

  • Gewoonlik versteen slegs die hardste dele. Die sagte dele verrot, maar laat soms afdrukke in die rots. Die fossiele van plante bestaan gewoonlik uit blaarafdrukke of versteende boomstompe. Fossiele van mikroskopiese stuifmeelkorrels is ook al gevind.
  • Fossiele is dus ons skakels met die verlede. Ongelukkig is fossilering ‘n unieke proses wat slegs onder spesiale toestande plaasvind. In Suid-Afrika was die toestande in die Karoo vir miljoene jare baie gunstig vir fossilering.
  • Miljoene jare gelede was die Karoo ‘n groot, moerasagtige kom wat ongeveer ‘n driekwart van die huidige Suid-Afrika se oppervlakte beslaan het. Riviere het van die berge in die kom gevloei. Plantfossiele bewys dat daar bosse en bome op die rivieroewers was. Die riviere het gekrioel van visse, reptiele en groot amfibieë, maar daar is nie tekens van voëls of soogdiere nie. Sowat 190 miljoen jaar gelede was daar hewige vulkaanuitbarstings in die Karoo, omdat Gondwana begin opbreek het in die kontinente soos ons dit vandag ken. Baie dele is met lawa bedek en dit het die diere verdryf.
  • Die Karoo het dus duisende goedbewaarde fossiele opgelewer.

Paleontoloë

  • Mense wat fossiele bestudeer, word paleontoloë genoem. Paleo-antropoloë bestudeer oermense, paleobotaniste bestudeer plantfossiele en paleosooloë bestudeer die oorblyfsels van diere. As al hierdie inligting gekombineer word, kan wetenskaplikes bepaal hoe die oeromgewing gelyk het.
  • Daar bestaan baie min mensagtige fossiele, omdat mense waarskynlik op plekke geleef het waar fossiele nie maklik kon vorm nie. Mensagtige fossiele is gewoonlik die oorblyfsels van die prooi wat deur vleiseters gevang is. Dit wil voorkom asof mensagtige fossiele minder geword het nadat die oermense geleer het om vuur te maak. ‘n Moontlike verklaring is dat die vuur dit moontlik gemaak het om die vleiseters uit die grotte te verjaag.

OPDRAG 7

Lees bostaande leesstuk deeglik deur en beantwoord dan die volgende vrae. Maak gebruik van ‘n bron soos ‘n verklarende woordeboek, indien nodig.

1. Hoe lank is ‘n eeu?

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(1)

2. Waarom het die Karoo soveel goedbewaarde fossiele opgelewer?

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3. Waarom word volledige fossielgeraamtes byna nooit gevind nie?

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4. Is die volgende stelling WAAR of ONWAAR? Motiveer jou antwoord.

Fossiele kan gesien word as ‘n bewys van vroeëre lewe.

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(2)

5. Gee ‘n beknopte definisie van ‘n fossiel. Gebruik jou eie woorde.

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(1)

6. Waarom sou jy sê is skulpe die mees algemene fossiele?

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7. Waarom is tande van oermense soms die beste fossiele?

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8. Gee ‘n definisie van ‘n wetenskaplike.

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9. Wat beteken die woordelement “paleo-“, in die volgende woorde: paleo-antropoloog, paleo-botanis en paleosoöloog?

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TOTAAL: 10

Assessering

Leeruitkomste 1: Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te regeer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Assesseringstandaard 1.2: Dis duidelik wanneer die leerder ondersoeke uitvoer en data versamel.

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.3: Dis duidelik wanneer die leerder inligting interpreteer.

Questions & Answers

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
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
How can I make nanorobot?
Lily
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
how can I make nanorobot?
Lily
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
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 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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