O Level Geography Archives - Page 9 of 35 - Free ZIMSEC & Cambridge Revision Notes

Water as a renewable resource

By Rachel Majaya|2025-02-12T09:12:23+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Water is a critical life resource.

ZIMSEC O Level Geography Notes:Water as a renewable resource

Water covers over two-thirds of the earth’s surface.
It is found in oceans, seas, lakes, rivers, ice caps, glaciers and in underground aquifers.
Of the world’s most abundant water resources, only 3% is fresh water and […]

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Fishing in Lake Kariba

By Rachel Majaya|2025-02-12T09:07:45+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Sun drying fish on Lake Kariba. Image credit yahoo.com

ZIMSEC O Level Geography Notes: Natural Resources: Fishing:Lake Kariba

It was constructed on the Kariba gorge between 1955 and 1959.
The dam has produced a lake with a surface area of 5 364 km².
Commercial fishing on Lake Kariba begun in 1962.

[…]

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Energy: Introduction

By Rachel Majaya|2025-02-12T09:26:42+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Power-line to transmit electrical energy

ZIMSEC O Level Geography Notes: Natural Resources:Energy

Energy is power.
It may exist in the form of potential or kinetic energy or in the form of fossil fuels and hydrocarbons.
It is also found in the form of light or heat energy.
Its sources cover all […]

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The energy crisis in Zimbabwe

By Rachel Majaya|2025-02-12T08:57:24+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Polling Stations in the Dark. Image credit mg.co.za

ZIMSEC O Level Geography Notes: Natural Resources: Energy:The energy crisis in Zimbabwe

The energy crisis in Zimbabwe is demonstrated through the following:

Frequent shortages of petroleum and its products resulting in long queues for the scarce commodity at service stations.
Fluctuating prices in the […]

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Anticyclones

By garikaib|2025-02-12T09:26:48+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Pictures showing wind direction in an anti-cylcone (right) in both the southern and nothern hemisphere. Image by Physical Geography ZIMSEC O Level Geography Notes: Anticyclones.

Features of anticyclones.

These are areas of high […]

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Drought

By garikaib|2025-02-12T09:06:30+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

Drought stressed maize. Image by Missouri.edu ZIMSEC O Level Geography Notes: Weather Hazards: Drought

In general terms drought is caused by a general shortage of precipitation over an extended period of time usually the rain season resulting in water shortages for both human and natural […]

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Lava Plateaus

By garikaib|2025-02-12T09:01:56+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Wind in deserts

By garikaib|2025-02-12T09:34:16+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

A sandstorm in a desert. Image credit annechia.com ZIMSEC O Level Geography Notes: Wind in Deserts

Wind is responsible for eroding, transporting and depositing materials in deserts.
To learn more go to Wind Action in Deserts.
Various landforms are formed by the above processes. […]

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River Erosion

By garikaib|2025-02-12T09:18:38+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

River erosion. Image credit Internationalarchives.org ZIMSEC O Level Geography Notes: River Erosion

River erosion involves the wearing away of rock and soil found along the river bed and banks.
It also involves the breaking down of the rock particles being carried downstream by the river.
There are four […]

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River rejuvenation

By garikaib|2025-02-12T09:13:25+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

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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February 2025