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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

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In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
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other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
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Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
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Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
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it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
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In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
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Answer
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c
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the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
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suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
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types of unemployment
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What is the difference between perfect competition and monopolistic competition?
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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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