January 2023

Ocean currents and the fishing industry

By |2022-09-15T12:34:44+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Ocean currents of the world. Image credit Pearson

ZIMSEC O Level Geography Notes: Natural Resources: Fishing:Ocean currents and the fishing industry

  • Ocean currents are important in the fishing industry as they affect the growth of plankton which provides fish food.
  • Warm ocean currents restrict the growth of plankton hence give rise […]
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Thermal Power: Locational Factors

By |2022-09-15T12:34:35+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Cooling towers. Hwange Thermal. Image credit esi-africa.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Thermal Power: Location Factors

Fuel source

  • Thermal power stations cab be located at the fuel source.
  • This is if the fuel is difficult to transport.
  • For example Hwange Thermal Power station is located at the coal fields.
  • The […]
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Advantages and Disadvantages of Solar energy

By |2022-09-15T12:34:22+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Solar Power Plant. Image credit sma-america.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Advantages and Disadvantages of Solar energy

 Advantages

  • Renewable energy source.
  • Plentiful and inexhaustible.
  • Very clean.
  • Relatively cheap.
  • Can power vehicles.
  • Suitable even in remote areas.
  • High energy output.
  • No pollutions associated with it.

Disadvantages

  • Expensive for poor rural communities.
  • Affected […]
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Sample surveys: collecting population data

By |2022-09-15T12:40:44+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Zimstat officials often carry out sample surveys. Image credit voazimbabwe.com Zimstat officials often carry out sample surveys. Image credit voazimbabwe.com ZIMSEC O Level Geography Notes: Population:Sample surveys: collecting population data

  • In a sample survey only part of the population is covered in the survey.
  • A survey is an exercise designed to obtain […]
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The effects of migration

By |2022-09-15T12:37:02+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Migration leads to pressure on resources in receiving areas. Image credit MediaWiki

ZIMSEC O Level Geography Notes: Migration: The effects of migration

  • The movement of people from one area to another has both positive and negative effects in both the area of origin and receiving areas.
  • These effects can be social, economic […]
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Problems caused by nomadism

By |2022-09-15T12:36:39+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Tuaregs of North Africa. Image credit thisfabtrek.com

ZIMSEC O Level Geography Notes:Agriculture:Farming types in Africa: Subsistence farming: Problems caused by nomadism

  • The way of life led by the nomads creates a lot of problems to the environment, to themselves, to other people and to African governments.
  • These problems include:

Cattle diseases.

  • These spread […]
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Gezira versus Lowveld Irrigation schemes

By |2022-09-15T12:36:30+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Gezira Irrigation cotton plants. Image credit MIT

ZIMSEC O Level Geography Notes:Agriculture:Farming types in Africa:Gezira  versus Lowveld Irrigation schemes

Gezira Irrigation Scheme

  • Is one of the largest irrigation schemes in the world
  • It is found int the state of   Al Jazirah in Sudan
  • It is located at the confluence of the […]
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Power supply and Location of industries

By |2022-09-15T12:36:20+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Power is important in industry

ZIMSEC O Level Geography Notes:Types of Industrial Location:Power supply and Location of industries

  • Almost all modern industries use electricity in their industrial process.
  • This power can come from individual small stations of thermal, nuclear or hydro-origin in which case the industries must locate close to the […]
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Modern Developments in Transport: Rail transport

By |2022-09-15T12:35:52+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

High speed “bullet” train. Image credit inhabitat.com

ZIMSEC O Level Geography Notes: Transport:Modern Developments in Transport: Rail transport

  • In advanced countries, high speed rail transport has been developed.
  • For example the Japanese have developed their high speed Bullet train which can reach speeds of 350 – 400 km per hour.
  • All […]
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