February 2025

Small scale energy sources and plants:Biogas plant

By |2025-02-12T09:44:21+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Biogas Digestor in rural Zimbabwe. Image credit climatetracker.org

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Small scale energy sources and plants:Biogas plant

  • To install a bio-gas plant, a pit is dug underground near to the kitchen the depth of which is determined by the size of the plant the family wants […]
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Folding

By |2025-02-12T09:22:02+02:00February 12th, 2025|Landform Studies, Notes, Ordinary Level Notes|

Simple Folding. Image by Pixshark. Simple Folding. Image by Pixshark. ZIMSEC O Level Geography: Folding

  • Tectonic movements are those movements that result from the earth’s internal forces.
  • When forces move horizontally towards one another they are known as compressional.
  • Rocks that make up the earth’s crust are subjected to these compressional forces in a […]
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Clouds

By |2025-02-12T09:11:51+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Clouds. Image by ThirdScribe. Clouds. Image by ThirdScribe. ZIMSEC O Level Geography Notes: Clouds

Refers to the fraction of the sky obscured by clouds when observed from a particular location. Okta is the usual unit of measurement of the cloud cover. Sky conditions are estimated in terms of how many eighths of the […]

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Unintentional changes to weather

By |2025-02-12T09:42:04+02:00February 12th, 2025|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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Advantages of Rift Valleys and Block Mountains

By |2025-02-12T09:36:35+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Yosemite Mountains and Valley. Image by Mountainprofessor. Yosemite Mountains and Valley. Image by Mountainprofessor. ZIMSEC O Level Geography Notes: Advantages of Rift Valleys and Block Mountains

Advantages of block mountains

  • Relief rainfall is common raising the amount of annual precipitation within the vicinity of such mountains.
  • They have a cooler environments which invigorating tends to […]
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Kopje, Tor and Balancing rocks

By |2025-02-12T09:21:33+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A Kopje. Image credit MediaWiki. A Kopje. Image credit MediaWiki. ZIMSEC O Level Geography Notes: Landforms resulting from Weathering: Kopjes

Tors/Kopjes/Castle kopjes

  • Tors/kopjes/castle kopjes are inselbergs.
  • Tors the same as kopjes even though some books make an attempt to distinguish between the two.
  • Different names are applied in different localities to what are essentially […]
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Transport: Draught power

By |2025-02-12T09:27:17+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Mules carrying packs. Image credit MediaWiki Mules carrying packs. Image credit MediaWiki ZIMSEC O Level Geography Notes: Transport: Draught Power
Draught power

  • Refers to the use of animals such as elephants, mules, donkeys, camels and horses

Advantages

  • It is cheap
  • It is much more readily available
  • Can scale steep terrain and reach inaccessible areas.
  • Does not require […]
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