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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

it is the relatively stable flow of income
Chidubem Reply
what is circular flow of income
Divine Reply
branches of macroeconomics
SHEDRACK Reply
what is Flexible exchang rate?
poudel Reply
is gdp a reliable measurement of wealth
Atega Reply
introduction to econometrics
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Tom
Why is unemployment rate never zero at full employment?
Priyanka Reply
bcoz of existence of frictional unemployment in our economy.
Umashankar
what is flexible exchang rate?
poudel
due to existence of the pple with disabilities
Abdulraufu
the demand of a good rises, causing the demand for another good to fall
Rushawn Reply
is it possible to leave every good at the same level
Joseph
I don't think so. because check it, if the demand for chicken increases, people will no longer consume fish like they used to causing a fall in the demand for fish
Anuolu
is not really possible to let the value of a goods to be same at the same time.....
Salome
Suppose the inflation rate is 6%, does it mean that all the goods you purchase will cost 6% more than previous year? Provide with reasoning.
Geetha Reply
Not necessarily. To measure the inflation rate economists normally use an averaged price index of a basket of certain goods. So if you purchase goods included in the basket, you will notice that you pay 6% more, otherwise not necessarily.
Waeth
discus major problems of macroeconomics
Alii Reply
what is the problem of macroeconomics
Yoal
Economic growth Stable prices and low unemployment
Ephraim
explain inflationcause and itis degre
Miresa Reply
what is inflation
Getu
increase in general price levels
WEETO
Good day How do I calculate this question: C= 100+5yd G= 2000 T= 2000 I(planned)=200. Suppose the actual output is 3000. What is the level of planned expenditures at this level of output?
Chisomo Reply
how to calculate actual output?
Chisomo
how to calculate the equilibrium income
Beshir
Criteria for determining money supply
Thapase Reply
who we can define macroeconomics in one line
Muhammad
Aggregate demand
Mohammed
C=k100 +9y and i=k50.calculate the equilibrium level of output
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Muhammad
I want to know how can we define macroeconomics in one line
Muhammad
it must be .9 or 0.9 no Mpc is greater than 1 Y=100+.9Y+50 Y-.9Y=150 0.1Y/0.1=150/0.1 Y=1500
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Kalombe
hi can someone help me on this question If a negative shocks shifts the IS curve to the left, what type of policy do you suggest so as to stabilize the level of output? discuss your answer using appropriate graph.
Galge Reply
if interest rate is increased this will will reduce the level of income shifting the curve to the left ◀️
Kalombe
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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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