O Level Geography Archives - Page 3 of 35 - Free ZIMSEC & Cambridge Revision Notes

Africa’s Energy Resources

By Rachel Majaya|2025-02-12T08:58:20+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Old Inga Dam DRC. Image credit internationalrivers.org

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Energy resources of Africa

Electricity is generated from two major processes, thermal and hydro.
The thermal component includes petroleum on top of coal for a number of countries such as Egypt, Algeria, Nigeria and Libya.
For other […]

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Frontal Systems

By garikaib|2025-02-12T09:10:40+02:00February 12th, 2025|O Level Geography, Weather and Climate|

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 A [...]
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Rainfall

By garikaib|2025-02-12T09:31:12+02:00February 12th, 2025|O Level Geography, Weather and Climate|

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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The internal structure of the earth

By garikaib|2025-02-12T09:10:23+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A cutaway showing the internal structure of the earth. Image by Teachastronomy. ZIMSEC O Level Geography Notes: The Internal Structure of the Earth

The internal structure of the earth is the foundaiton upon which the external landforms on the earth’s […]

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Benefits and Problems of Volcanoes

By garikaib|2025-02-12T09:04:37+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Fertile volcanic soil Kenya. Image credit tishaferral.com ZIMSEC O Level Geography Notes: Benefits and Problems of Volcanoes

Benefits of volcanoes to humans

They eject lava and ash which in turn produce very fertile soils which boost agriculture activities.
Volcanoes and areas near them can […]

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Wind Action in Deserts: Wind Transport and Deposition

By garikaib|2025-02-12T09:38:25+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Wind transportation methods. Image credit apod.com ZIMSEC O Level Geography Notes: Wind Action in Deserts: Wind Transport

Wind is able to transport (move) sand and dust particles depending on its speed and flow.
The effectiveness of wind erosion and transport depend on a number of factors:
Aeolian […]

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River Deposition

By garikaib|2025-02-12T09:22:04+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

River deposition (left bank). Image credit Panoramio. ZIMSEC O Level Geography Notes: River deposition

Deposition occurs when a river no longer as sufficient energy to transport its load.
When its velocity begins to fall and has less energy, a river’s competence (maximum size of material […]

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Drainage Basin

By garikaib|2025-02-12T08:57:31+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

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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Sea Transport

By garikaib|2025-02-12T09:32:45+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

An ocean bulk cariar. Image credit malaquaylogistics.com An ocean bulk carrier. Image credit malaquaylogistics.com ZIMSEC O Level Geography Notes: Transport: Sea Transport

Advantages

Is relatively cheaper.
Caries bulky goods at once
They are very comfortable for example cruise ships and ocean liners are often fitted with luxury facilities such as bathrooms, toilets, casinos and […]

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Effects of urbanization

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

Illegal houses being demolished in Epworth, Harare. Image credit voicesofafrica.co.za ZIMSEC O Level Geography Notes: Settlements:The benefits and problems of urbanisation

Urbanisation brings about certain effects
There negative and positive effects
These effects affect both the source (rural areas) and receiving areas (the […]

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February 2025