January 2023

Rainfall

By |2022-09-15T12:44:50+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Rainfall. Image via the Herald.

Rainfall. Image via the Herald. ZIMSEC O Level Geography Notes: Rainfall.
  • Rainfall is just one form of precipitation.
  • Precipitation occurs when warm moist air rises or is forced to rise.
  • Water vapor in the air parcel cools and condenses to form clouds.
  • This is because temperature falls with increase […]

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Lava Plateaus

By |2022-09-15T12:44:27+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup.

Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup. ZIMSEC O Level Geography Notes: Lava Plateaus
  • Lava eruptions through narrow cracks (fissures) tends to be very quiet and subdued.
  • The lava spreads out over the surrounding countryside.
  • Successive lava outpourings causes successive layers of lava to […]

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Water in Hot Deserts

By |2022-09-15T12:44:12+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Flash floods in a desert. Image credit Backroadswest.com

Flash floods in a desert. Image credit Backroadswest.com ZIMSEC O Level Geography Notes: Water in Hot Deserts
  • Water action in deserts can be divided into three:
  • freak storms or rain that falls sometimes in semi-arid regions,
  • dew which plays formed as a result of temperatures […]

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River rejuvenation

By |2022-09-15T12:43:56+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Paired terraces resulting from rejuvination. Image credit Geographyas.info

Paired terraces resulting from rejuvination. Image credit Geographyas.info ZIMSEC O Level Geography Notes: River Rejuvination
  • Rejuvenation-occurs when there is a negative change in a river’s base level (i.e. when the river’s base level falls) which increases its potential energy and thus enables it […]

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Earthquakes and their causes

By |2022-09-15T12:44:25+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Destruction wreaked by an earthquake. Image credit Telegraph.co.uk

Destruction wreaked by an earthquake. Image credit Telegraph.co.uk ZIMSEC O Level Geography Notes: Earthquakes and their causes
  • An earthquake is a shaking, vibration, trembling or movement in the earth’s crust.
  • They are caused by one tectonic plate sliding over or past another plate along […]

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Wadis,Bahadas and the Desert Piedmont zone

By |2022-09-15T12:44:11+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Alluvial fan/Bajada/Bahada. Image credit MediaWiki

Alluvial fan/Bajada/Bahada. Image credit MediaWiki ZIMSEC O Level Geography Notes: Wadis and Bahadas

Wadis/Canyons

  • As already pointed out freak storms occur in deserts characterised by excessive precipitation over short periods of time.
  • Due to infiltration excess flow and even saturation excess flow there is significant run off in the […]

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Drainage Basin

By |2022-09-15T12:43:41+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, River Processes|

The drainage basin. Image credit BBC.

The drainage basin. Image credit BBC. ZIMSEC O Level Geography Notes: Drainage Basin
  • The term drainage basin refers to an area of land drained by a river and its tributaries (river system).
  • It includes water found in the water table and surface run-off.
  • The drainage basin is also known […]

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Frontal Systems

By |2022-09-15T12:44:59+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Weather on a Front. Image by DiyMid.

Weather on a Front. Image by DiyMid. ZIMSEC O Level Geography Notes: Fronts

Fronts

-A front is a boundary between two air masses. Fronts are classified and named according to which air mass is replacing the other.

Warm Front


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Convectional rainfall

By |2022-09-15T12:44:49+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi ZIMSEC O Level Geography Notes: Convectional Rainfall
  • This is the main type of rainfall in the humid tropics such as the Amazon and Congo rain forests.
  • Occurs when the ground surface is locally […]

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