<< Chapter < Page Chapter >> Page >

Afrikaans huistaal

Graad 9

Module 14

Om vrae te kan stel oor belangrike kwessies

Aktiwiteit 1:

Om vrae te kan stel oor belangrike kwessies, bv. die osoonlaag, en om oorsaak en gevolg in meer diepte oor die kurrikulum heen te ontleed

[lu 5.1]

Lees die onderstaande NW-taak wat deur ‘n Graad 9-leerder opgestel is en beantwoord dan die vrae wat daarop volg:

“think globally, act locally”

Die kweekhuiseffek, rook en stofwolke wat sonlig uitblok en osoonuitdunning het ‘n reuse invloed op die aarde en sy inwoners. Dit is nie ‘n probleem net vir wetenskaplikes en volwassenes nie, maar wel iets waaraan elke liewe persoon iets kan doen. In jou nabye omgewing en alledaagse lewe is daar baie wat ek en jy kan doen om hierdie probleme aan te spreek.

Die meeste van die energie wat ons vandag gebruik, kom van die verbranding van die fossielbrandstowwe van steenkool, olie en gas. Terwyl dit brand, word nie net hitte nie, maar ook koolstofdioksied afgegee. Soos meer en meer fosssielbrandstowwe verbrand word, bou meer en meer koolstofdioksied in die atmosfeer op en dit veroorsaak dat hitte nie in die ruimte kan ontsnap nie. Dit word die kweekhuiseffek genoem.

Bome maak vir ons suurstof en help ook om koolstofdioksied op te gebruik. Maar wat het die mens gedoen? Ons het al byna al ons bome afgekap, alles in die naam van moderne tegnologie en vooruitgang. Kragstasies, fabrieke en motors stel skadelike gasse vry wat bokant ons stede in die vorm van ‘n rookmis hang. Dit meng dan met water in die lug en vorm sure. Wanneer dit reën, beskadig hierdie sure ons woude nog verder. In Brittanje is meer as 60% van die woude al deur suurreën beskadig.

Om te verhoed dat meer koolstofdioksied in die lug vrygelaat word, moet ons die gebruik van hernieubare energiebronne vermeerder en energie meer doeltreffend gebruik.

Het jy al ‘n kweekhuis gesien? Dit is ‘n glashuisie en word gebruik om plante in veral die winter te laat groei. Die kweekhuis vang die hitte van die son vas deur die glaspanele wat lig inlaat, maar keer dat hitte ontsnap. Die kweekhuis word dus warm – baie soos ‘n motor wat in die son geparkeer is. Kweekhuisgasse in die atmosfeer tree baie soos die glaspanele van die kweekhuis op. Sonlig kom die aarde se atmosfeer binne deur die komberslaag van kweekhuisgasse. As dit die aarde se oppervlakte bereik, absorbeer die land, water en die biosfeer die sonlig se energie.

As dit eers geabsorbeer is, word hierdie energie terug in die atmosfeer gestuur. Sommige van die energie gaan terug in die ruimte, maar baie bly oor, vasgevang in die atmosfeer deur die kweekhuisgasse, nl. metaan, waterdamp, koolstofdioksied en stikstofdioksied. Dit veroorsaak dat die wêreld warmer word en daarsonder sal mens en dier nie op die aarde kon leef nie. Die probleem is egter dat die kweekhuiseffek sterker word en dat die aarde warmer as gewoonlik word. Selfs net ‘n klein bietjie ekstra verwarming kan probleme vir die lewe op aarde veroorsaak. Wetenskaplikes glo dat die temperatuur al tussen 2°C tot 6°C gestyg het.

Hierdie globale verhitting veroorsaak veranderinge in die klimaat. ‘n Warmer aarde sal lei tot veranderinge in reënvalpatrone, verhoging van die seevlakke en moontlike oorstromings as gevolg van die ysgletsers wat smelt. Dit sal ook ‘n negatiewe impak op lewende wesens hê omdat dit bv. oeste gaan beïnvloed.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Afrikaans huistaal graad 9. OpenStax CNX. Sep 14, 2009 Download for free at http://cnx.org/content/col11058/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Afrikaans huistaal graad 9' conversation and receive update notifications?

Ask