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

Energy:The siting and production of Hydro-electric power: Gorges

By Rachel Majaya|2025-02-12T09:27:59+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Kariba dam wall. Image credit Bloomberg.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:The siting and production of HEP

Site refers to the actual ground on which something is happening.
The siting of a hydro-electric power station depends on a number of physical factors.

Gorge

A gorge is a deep narrow […]

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Advantages and Disadvantages of coal as a source of energy

By Rachel Majaya|2025-02-12T08:58:53+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Burning coal

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Advantages and Disadvantages of coal as a source of energy

Advantages

Relatively high energy amount.
Fairly plentiful with global estimate use of 4 000 years.
Employment creation in mining, processing, burning and distribution.
Has many other industrial uses.
Relatively cheap energy source.

Disadvantages

Non-renewable […]

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Air Masses

By garikaib|2025-02-12T09:07:38+02:00February 12th, 2025|O Level Geography|

World Winds and Pressure Systems. Image by Wikipedia Air masses

Air Masses

An air mass is a large body of air, whose properties – temperature, humidity (air moisture) and lapse rate – are largely uniform (the same) over an area several hundred kilometers across.
The regions […]

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Orographic/Relief Rainfall

By garikaib|2025-02-12T09:31:47+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Aberfoyle Tea Estate in the Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. Aberfoyle Tea Estate in the Honde Valley Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. ZIMSEC O Level Geography Notes: […]

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The theory of continental drift

By garikaib|2025-02-12T09:12:29+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Evedence for the continental drift. Image by Wiki Commons. Evidence for the continental drift. Image by Wiki Commons. ZIMSEC O Level Geography Notes: The theory of continental drift

The theory of or idea that present day continents were once one single continent.
Continental drifts refers to the movement of continents.
The theory says that […]

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Earthquakes and their causes

By garikaib|2025-02-12T09:05:59+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Deflation Hollows

By garikaib|2025-02-12T09:40:09+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Deflation Hollow. Image via Imgkid ZIMSEC O Level Geography Notes: Deflation Hollows

Are also known as closed hollows or blowouts.
These are enclosed depressions caused by wind erosion.
In deserts the wind erodes loose material from flat areas which have, uncemented sediments such as those occurring in […]

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Factors affecting erosion, transportation and deposition

By garikaib|2025-02-12T09:28:32+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Laminar Flow. Image credit gjhikes.com ZIMSEC O Level Geography Notes

The following factors affect the river’s energy and ability to erode, transport and deposit its load.
Type of flow, gradient of channel, volume/discharge, cross-sectional channel shape, channel roughness.

Type of flow Laminar and Turbulent [...]
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Surface Water flow and the origin of rivers

By garikaib|2025-02-12T08:58:40+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Natural Springs contribute their water to rivers and often form the source of rivers. Image credit paintballfun.com ZIMSEC O Level Geography Notes: Surface Water Flow and the Origin of rivers