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Natuurwetenskappe

Graad 8

Biodiversiteit: aanpassings en oorlewing

Module 24

Fossiele

Fossiele is die oorblyfsels van dooie plante, diere, bakterieë en ander lewensvorme wat miljoene jare gelede geleef en toe versteen het.

Fossiele is dus versteende oorblyfsels van organismes, bv. tande, bene, bas of skulpe. Dit kan ook spore of afval van organismes wees.

1. Wanneer ’n dier/organismes doodgaan vergaan die sagte dele eerste. Die res word in die sand of modder bedek.

2. Oor miljoene jare vind chemiese veranderinge sowel as drukking plaas wat dit laat versteen.

3. Water wat deursyfer kan ook veranderinge teweeg bring. Die vorms word goed behou.

4. Beweging van die aardplate bring die fossiele na die oppervlak.

Aktiwiteit: om navorsing oor fossiele te doen

  • Wat is ’n paleontoloog?

OPDRAG: Teken ’n vloeidiagram om die fossielvormingsproses eenvoudig voor te stel.

Assessering van vloeidiagram:

Kon jy ’n sinvolle vloeidiagram van die fossielvormingsproses teken?

[LU 2.2]

Aanpassings – Fossiele

AKTIWITEIT:

  • Bestudeer die volgende prente van fossiele en probeer afleidings maak t.o.v. hul voeding en bewegings:

Skedel van ’n Suid-Afrikaanse dinosourus ( Mossospondvlus )

Brachiopoda skulpe in ’n 500 – 300 miljoen jaar oue strandneersaksel

Skedel van ’n Suid-Afrikaanse dinosourus ( Mossospondvlus )

’n Vlieg wat in die 90 miljoen jaar oue neerslae van die Orapa diamantkrater gevind is (Botswana)

Assessering van afleiding:

Kon jy die korrekte afleidings t.o.v. die fossielsketse maak?

[LU 2.3]

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.

Memorandum

Fossiele

Klasaktiwiteit: FOSSIELTEKENINGE

  • Kry bronne oor fossiele, paleontoloë en opgrawings
  • www.ru.ac/za/pssa/pssalaw.hrml - fossils and SA law

Aktiwiteit:

  • Wat is 'n paleontoloog?

Persoon wat fossiele bestudeer

  • Wat sê die wet?

OPDRAG:

  • Teken 'n vloeidiagram om die fossielvormingsproses eenvoudig voor te stel.

Sagte dele vergaan – drukking – water vervorm – verstening – verskuiwings

Aktiwiteit: Afleidings

Questions & Answers

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
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Akash Reply
it is a goid question and i want to know the answer as well
Maciej
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Abigail
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
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
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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