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Social sciences: geography

Grade 6

Climate and vegetation regions of the world

Module 8

The climate and vegetation regions of the world

You have learnt that prevailing weather conditions form the climate of a particular place over a period of time (20 – 35 years). As the weather is unpredictable, we are not able to say for sure that it will rain in Cape Town on New Year’s Day, but we do know that Cape Town will normally be drier at this time of the year than in June. Climatic conditions over a long period of time have shown that Cape Town receives most of its rain during the winter.

When we study the features of the types of climate that prevail in places, it is clear that large areas experience the same average conditions and that a type of climatic region is therefore formed. Through the ages people have often been influenced by the climate when they must to decide where they want to settle. Large parts of the earth are either too cold, or dry or hot for people to live. The availability of sources also influences peoples’ choice of a place to live. That is why approximately six milliard people on earth occupy only 15% of the earth’s surface.

1. Factors that influence climate

  • You have learnt in grade 5 that there are many factors that influence the climate of a region. We are now going to take a look at the factors that influence the worlds climate.

Latitude of a place

The hottest climates are usually in places closest to the Equator. The further we move from the Equator, the colder it becomes. At 12:00 the sun is directly overhead on the Equator. The rays of the sun are more concentrated and the temperatures rise higher. Further north and south the rays of the sun fall at an angle and are spread over a larger area by the earth’s rounded shape. That is why the sun’s rays are less concentrated and as a result the temperatures are cooler.

At the equator the sun’s rays are almost directly overhead.

At the poles the sun islower on the horizon.

At the Equator high temperatures cause high evaporation, which causes a higher downpour.

Altitude above sea level

The earth absorbs the sun’s rays, converts them to heat and radiates them again. The closer we are to the source of radiation, the hotter it is, and the further we are from the source (e.g. on top of a mountain), the colder it becomes. We can experience the principle of radiation by holding our hands close to a fire (or heater) and then move them away gradually. It becomes colder the further we move away from the source.

It is always cold on top of high mountains. The highest mountain peaks on the earth are always covered with snow.

Activity 1:

To find information in an atlas

[lo 1.2, 1.3]

Use your atlas to find out:

  • the name and altitude of the highest mountain peak in South Africa;
  • the latitude and longitude co-ordinates for Mount Kilimanjaro.

Influence of ocean currents/oceans

The temperatures of the oceans influence the land temperatures. Winds blow the hot or cold air above the hot or cold ocean towards the land and increase or reduce the land temperatures. There are also winds that blow north and southwards from the Polar Regions bringing cold air onto the land.

Questions & Answers

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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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
characteristics of micro business
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
what is biological synthesis of nanoparticles
Sanket 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, Geography grade 6. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col11000/1.1
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