February 2017

Irrigation Farming

By |2022-09-15T12:36:33+02:00February 8th, 2017|Notes, O Level Geography, Ordinary Level Notes|

Small scale irrigation. Image credit wfp.org

ZIMSEC O Level Geography Notes:Agriculture:Farming types in Africa:Irrigation Farming

  • This is the artificial application of water on land in order to grow crops when prevailing climatic and weather conditions cannot sustain such crop growth.
  • This expensive farming system is carried out in order to:
    1. Increase […]

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January 2017

Terms used in Population studies

By |2022-09-15T12:36:58+02:00January 30th, 2017|Notes, O Level Geography, Ordinary Level Notes|

ZIMSEC O Level Geography Notes:Population Studies:Terms used in Population studies

  • Birth Rate (or crude birth rate) is the number of live births per 1,000 of the population in a given year. (Not to be confused with the growth rate).
  • Brain Drain is the emigration of a significant proportion of a country’s highly […]

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June 2015

Meanders

By |2022-09-15T12:44:00+02:00June 21st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Meandering river. Image credit wordpress.com

Meandering river. Image credit wordpress.com ZIMSEC O Level Geography Notes: Meanders and Ox-bow lakes

Meanders

  • Meanders are pronounced bends in a river’s course
  • They are formed when a river twists and turn in wide bends.
  • They are common on the floodplain but can develop in any part of the […]

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Yardangs, Zeugens and Rock Pedestals

By |2022-09-15T12:44:14+02:00June 14th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Zeugens. Image credit Revisionworld.com

Zeugens. Image credit Revisionworld.com ZIMSEC O Level Geography Notes: Hot Deserts: Yardangs

Zeugens

  • Pictured in the diagram above.
  • Zeugens are the ridges in “ridge and furrow” landscapes found in deserts.
  • These ridge and furrow landscapes sculpted found in hot deserts are a result of wind erosion.
  • Wind abrasion turns a desert surface […]

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Landforms resulting from faulting

By |2022-09-15T12:44:30+02:00June 4th, 2015|Landform Studies, Notes, O Level Geography|

The Great African Rift Valley. Image by Mamonthsafaris.

The Great African Rift Valley. Image by Mamonthsafaris. ZIMSEC O Level Geography Notes: Landfroms resulting from faulting.

Major landforms that result from faulting include:

  1. Block Mountains
  2. Rift valleys
  3. Tilted blocks.

1. Block Mountains The formation of block-mountains (Horst). Image by WikiComons


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May 2015

Unintentional changes to weather

By |2022-09-15T12:44:41+02:00May 29th, 2015|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

ZIMSEC O Level Geography Notes: People and Weather: Accidental Changes

Acid Rain

  • The smoke from burning fuels and chemical industries rises into the air and mixes with water vapour.
  • When the rain falls down it becomes acidic.
  • The acid rain is a weak acid made up of sulphuric and nitric acids.
  • Over, a long time (years for example), the rain […]

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