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Natuurwetenskappe

Graad 9

Die aarde, sterrestelsels en ruimteprogramme

Module 13

Die aarde en sy eienskappe

Die aarde het drie lae:

  • Binnekern – baie dig; ongelooflik warm!
  • Buitekern – in ’n gesmelte toestand
  • Mantel – gesmelte rots
  • Kors – soliede rots (baie dun)

Aktiwiteit 1:

Om die drie lae van die aarde aan te dui.

Teken die drie lae in die bygaande sirkel. Gebruik verskillende kleure om verskillende lae aan te dui.

Assessering van skets:

Het jy die lae korrek voorgestel?

[LU 2.3]

  • Die kern bestaan uit yster en nikkel, terwyl die kors uit suurstof en silikon bestaan.
  • In die sagte mantel is silikate, oksiede en sulfate.

Hoekom draai die aarde?

  • Die aarde draai omdat hy in die rigting van die son “val”. Dit is die son se swaartekrag wat die aarde om sy as laat draai.
  • Dit is soos ’n bal wat teen ’n heuwel afrol.
  • Die aarde draai elke 24 uur een maal om sy eie as.
  • Elke planeet in die sonnestelsel beweeg ook om die son op ’n pad wat ons sy wentelbaan (“orbit”) noem.
  • Die aarde neem 365¼ dae om een so ’n wentelbaan te voltooi. Dit word ook ’n revolusie genoem, of, in die algemene taal, ’n jaar (‘ aardjaar’ ).
  • Dit neem elke planeet ’n bepaalde aantal aardjare om een maal om die son te wentel.
  • Mars het byvoorbeeld ’n revolusietydperk van 1,9 aardjare.
  • Jupiter neem 11,9 aardjare en Pluto neem 247,7 aardjare.

Hoe groot is die aarde?

Verdeel in groepe vir die volgende aktiwiteit.

Aktiwiteit 2: om die grootte van die aarde te bespreek.

Gegewens oor die aarde:

Omtrek by pole
  • 40 008 km
Deursnit by pole
  • 12 714 km
Omtrek by ewenaar
  • 40 075 km
Deursnit by ewenaar
  • 12 714 km

1. Wat kan julle uit hierdie statistiek ten opsigte van die vorm van die aarde aflei? Wat sou die verklaring hiervoor wees?

2. Wie was Eratosthenes en wat het hy alreeds 2 000 jaar gelede oor die vorm van die aarde gesê? Bespreek in groepe en skryf die antwoorde neer. ( www.union.edu/PUBLIC/GEODEPT/hallocher/sciencelab/Labs/ ND2/LN2.htm)

Assessering van BESPREKING:

[LU 1.2; LU 1.3]

Waarom is lewe op aarde moontlik?

  • Dit is die enigste planeet waar daar ’n atmosfeer met suurstof in is en waar oppervlakwater voorkom. Lewe soos ons dit ken, benodig suurstof en water!
  • Die oseane beslaan sowat 70% van die aarde se oppervlak.
  • Die aarde se atmosfeer bestaan uit die volgende gasse:
  • suurstof (21%)
  • stikstof (78%)
  • argon (0,9%)
  • koolstofdioksied (0,03%)

Aktiwiteit 3: om die samestelling van die aarde se atmosfeer deur middel van ‘n sirkeldiagram aan te dui.

Dui die samestelling van die atmosfeer in persentasies met verskillende kleure in die sirkel aan.

Jy moet dit wiskundig uitwerk.

Assessering van sirkeldiagram:

Het jy die diagram korrek voorgestel?

[LU 2.4]

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 word bewys as die leerder:

1.1 ondersoeke beplan;

1.2 ondersoeke uitvoer en data versamel;

1.3 data evalueer en bevindinge kommunikeer.

LU 2

Konstruksie van Wetenskapkennis

Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewings- kennis toe.

Dit word bewys as die leerder:

2.1 betekenisvolle inligting kan oproep;

2.2 inligting kan kategoriseer;

2.3 inligting kan interpreteer;

2.4 kennis kan toepas.

Memorandum

AKTIWITEIT 2: HOE GROOT IS DIE AARDE?

1. Die vorm is nie heeltemal rond nie. Dit is effe afgeplat by die pole omdat die aarde by die ewenaar vinniger draai.

2. ’n Griekse filosoof wat die eerste was om met ’n berekening te toon dat die aarde rond is.

AKTIWITEIT 3: SIRKELDIAGRAM

Die atmosfeer bestaan uit 21% suurstof, 78% stikstof en 0.03 % koolstofdioksied, asook 0.9 % argon

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
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Sherica
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Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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
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Yasmin
what is the function of carbon nanotubes?
Cesar
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
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele 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 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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