GRADE 11 GEOGRAPHY SUMMARY
This summary covers:
1. The Atmosphere
2. Development Geography
This summary can be used for CAPS and IEB, I wrote IEB however used a CAPS textbook as it was recommended by my teacher.
GRADE 11 GEOGRAPHY IEB SYLLABUS
This summary covers:
1. The Atmosphere
2. Development Geography
This summary only contains 2/5 chapters of the Grade 11 Geography IEB Syllabus. The two
chapters it doesn’t contain is: Geomorphology, Resources + Sustainability and Mapwork.
,Grade 11 Geography IEB Syllabus
THE ATMOSPHERE
Aspect:
- As a result of the difference in heating at different latitudes, places in the southern
hemisphere that face the Equator (north) receive more sunlight, this is known as
aspect.
- This causes local and regional differences in the amount of heat received on north-
facing and south-facing slopes.
Tri-cellular Circulation:
- Describes a system of circulatory cells that move air about the planet.
Hadley cells
- Air at the equator is heated and ascends vertically.
- Air reaches the top of the troposphere and diverges polewards.
- Air, that lost some of its initial heat, sinks.
- Air diverges at the surface and flows either back towards the Equator (creating the
first cell of the tri-cellular model) or is pushed into the subtropics (and resulting the
second cell – the ferrel cell).
, Grade 11 Geography IEB Syllabus
Tropical easterlies
- Surface winds that occur in the Hadley cell and flow from east to west
- They pull the diverging air at the subtropics back towards the Equator
- Subtropical westerlies
- Flow polewards of the high pressure belt
- Push part of the diverging air mass into the Ferrel Cell and on towards the poles.
- Rising warm, moist air
Ferrel cells
- The second cell
- Warmer air moving out of the subtropics collide with cold air flowing down from the
poles called the polar front.
- Warmer, more humid air pushed by the subtropical westerlies overrides the colder,
dry air drawn down by the polar easterlies.
- This creates an area of low pressure named the subpolar low pressure belt.
- The sporadic mixing of these otherwise separate air masses is responsible for the
formation of mid-latitude cyclones that help account for WC's rainfall.
- Having risen along the polar front, the ascending air diverges along the upper edge
of the troposphere.
- Some of this air flows back towards the Hadley cell, it will converge with the air
moving out of the equatorial region.
- Remaining air mass will be pulled into the final cell of the tri-cellular model, the Polar
cell.
- Chilled by cold conditions, the now heavy air will descend about the poles.
Polar cells
- Air at the northernmost latitudes is extremely cold, sinks under its great density.
- Polar easterlies push this cold, dry sinking air back towards the pole front, where it
collides with the arriving subtropical air.
- Descending cool, dry air
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller kaylinteneal. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.65. You're not tied to anything after your purchase.
