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Natuurwetenskappe

Graad 5

Die aarde en die heelal

Module 21

Hoe grond gevorm word

Aktiwiteit:

Om te kan verduidelik hoe grond gevorm word en hoekom grond vir diere belangrik is

[lu 1.3]

Die aarde bestaan uit hoofsaaklik drie lae: die kors, die mantel en die kern.

Die kors is die dunste laag en is ongeveer 35 tot 50 km dik. Dit bestaan hoofsaaklik uit soliede rots.

Die rotse aan die oppervlak breek voortdurend op om grond te vorm. Dit gebeur deurdat die hitte van die son en die koue van die nag die rotse weens uitsetting en inkrimping laat kraak.

Plantwortels veroorsaak dat die rotse nog verder opbreek. Nuwe plante groei in die skeure. Hulle vrek en verrot, en hierdie verrotte materiaal saam met kleiner rotsdeeltjies vorm grond.

Water (reën, riviere, die see) laat die rotse ook verder opbreek en spoel die deeltjies ook weg na ander plekke waar dan ook grond gevorm word. Baie klein deeltjies word ook deur die wind versprei.

Hoe word grond deur diere benut?

Skryf die dierename neer wat grond op een of ander manier benut, en verduidelik hoe hulle dit benut. Begin met die diere in die illustrasies hierbo en vul aan met nog meer voorbeelde van jou eie.

Wat gebeur met hierdie diere as hulle in of op die grond vrek?

Assessering

LU 1

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

Dit is duidelik wanneer die leerder:

1.1 ondersoeke beplan;

1.2 ondersoeke uitvoer en data versamel;

1.3 data evalueer en bevindinge kommunikeer.

Memorandum

voorbeelde van diere wat die grond benut:

  • Erdwurm vreet verrottende materiaal in grond, grond beskerm teen hitte en uitdroging, asook predatore
  • Miere stoor kosvoorrade en eiers
  • Jagspinnekop tonnel in grond beskerm teen elemente en predatore
  • Haan/hen kry kos in/op grond, sand help met fynmaal van kos vir vertering
  • Haas Beskerming teen roofdiere, plek om kleintjies groot te maak
  • Mol Vind kos in grond (plantwortels en insekte)
  • Paddas Beskerming teen uitdroging en koue, oorlewing van ongunstige tydperke
  • Slange Beskerming teen natuurelemente en predatore
  • Vlakvarke Beskerming teen predatore

Diere wat vrek: hulle ontbind en die reste word deel van die grond, en so word grondvrugbaarheid bevorder.

Questions & Answers

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
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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
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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
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Porter
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Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
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Ramkumar Reply
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Sravani Reply
what is system testing?
AMJAD
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Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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