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Natuurwetenskappe

Planeet aarde en die heelal

Die aarde

Opvoeder afdeling

Memorandum

Opdrag 1:

  • Assesseer volgens assesseringsmatriks.

Opdrag 2:

Hoofgedagtes:

  • Aardbewing: oggend van 29 September 1969.
  • Registreer 6,5 op Richterskaal.
  • Chaos veroorsaak in meeste plekke.
  • Gedreun het al harder geword en toe geweldige skudding.
  • Hele aarde het gebewe en mense het paniekerig rondgehardloop.
  • Reddingswerkers het poskantoor as basis gebruik omdat dit enigste plek met elektrisiteit was.
  • Huise is erg beskadig en mense is ernstig beseer.
  • Noodhulp het na rampdorpe ingestroom en weermag en polisie het saamgewerk.
  • Mense in tente gehuisves en veldhospitale is opgerig.
  • Waternood is verlig en voedsel verskaf.
  • R13 miljoen geskenk deur rampkomitee.

Opdrag 3:

  • (skets)

Opdrag 4:

1. Die Richterskaal is die instrument (skaal) wat seismoloë gebruik om die sterkte van ‘n aardbewing te bepaal.

2. Seismoloë is wetenskaplikes wat aardbewings bestudeer.

3. Die plek waar die golwe (trillings) die eerste keer aan die aardoppervlak raak, word die episentrum genoem.

4. Indien die drukking in die mantel onder die aardkors opbou, word magma deur swak plekke en krake gedwing. Hierdie swak plekke vorm dan vulkaniese pype.

5. Aktiewe vulkane is vulkane wat van tyd tot tyd uitbars.

Leerder afdeling

Inhoud

Aktiwiteit: om die struktuur van die aarde te ontleed en om bewegings daarbinne te meet (natuurrampe) [lu 2.1, lu 2.3]

STRUKTUUR VAN DIE AARDE

  • Wetenskaplikes meen dat die aarde waarskynlik sowat 4 600 miljoen jaar gelede ontstaan het as ‘n groot wolk gasse en stof wat in die ruimte rondgedraai het. Terwyl dit gedraai het, het dit gekrimp tot ‘n vuurwarm, vloeibare bal. Die oppervlak het geleidelik afgekoel en ‘n kors van soliede rots gevorm wat verweer het tot die berge, grond en sand waarop ons vandag lewe.
  • Die aarde is gedurig besig om te verander. Die landmassas (kontinente) beweeg nie net nie, maar nuwe kors word gedurig gevorm. Die beweging van die aardkors word kontinentale drywing genoem en dit gaan steeds voort. Amerika beweeg byvoorbeeld geleidelik weg van Europa en dit het al telefoonkabels onder die Atlantiese Oseaan laat breek.

VIER AARDLAE

  • Aardkors

Die aardkors is die boonste laag en het ‘n deursnee van 5 km tot 70 km. Waar daar berge is, kan die deursnee tot 70 km wees, maar onder oseane is dit maar sowat 5 km dik. Onder die aardkors is daar nog drie lae, nl.

  • Mantel

Die mantel het ‘n deursnee van 2 900 km. Dit is solied, hoewel daar strome digte halfgesmelte metale voorkom wat baie stadig vloei.

  • Binnekern

Die binnekern in die middel van die aarde is waarskynlik solied en bestaan meestal uit metale. Dit het ‘n deursnee van 2 440 km en die temperatuur is 3 700 grade Celsius. Water kook teen 100 grade Celsius op die aarde!

  • Buitekern

Die buitekern bestaan uit vloeibare metaal en is verantwoordelik vir die aarde se magneetveld. Dit het ’n deursnee van 2 240 km.

Wanneer vulkane uitbars, kom die magma of lawa uit die mantel.

OPDRAG 1: GROEPWERK

Gebruik speeldeeg (vier verskillende kleure) en maak ‘n model van die aarde se struktuur. Die dikte van elke laag moet min of meer in verhouding wees met die werklikheid. Gebruik ‘n rooi balletjie klei om die kern van die aarde aan te dui.

Questions & Answers

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
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
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
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
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 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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