O Level Geography Archives - Page 20 of 35 - Free ZIMSEC & Cambridge Revision Notes

Natural Resources: Water conservation

By Rachel Majaya|2025-02-12T09:25:37+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Conservation of water is important. Image credit voanews.com

ZIMSEC O Level Geography Notes: Natural Resources: Water:Water conservation

Water conservation is the management of water resources in ways that prevent them from pollution.
It includes all the policies, strategies and activities made to sustainably manage the natural resource fresh water.
It also […]

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Sea fisheries found on the east coast of Southern Africa

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

Fishing on the Beira Coast in Mozambique. Image credit irinnews.org

ZIMSEC O Level Geography Notes: Natural Resources: Fishing: Sea fisheries on the east coast of Southern Africa

The east coast of Southern Africa is washed by warm ocean currents, like the Mozambique current and the warm Agulhas current.
The area therefore […]

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Geothermal power: Introduction

By Rachel Majaya|2025-02-12T09:34:50+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Geothermal Power Station. Image credit MediaWiki

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Geothermal power

Geothermal power is generated using steam rhythmically shooting out from underground at high pressure in the form of geysers.
To control the movement of steam, an intricate network of pipes is installed collecting and directing the […]

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Advantages and Disadvantages of Solar energy

By Rachel Majaya|2025-02-12T09:00:48+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Solar Power Plant. Image credit sma-america.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Advantages and Disadvantages of Solar energy

Advantages

Renewable energy source.
Plentiful and inexhaustible.
Very clean.
Relatively cheap.
Can power vehicles.
Suitable even in remote areas.
High energy output.
No pollutions associated with it.

Disadvantages

Expensive for poor rural communities.
Affected […]

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Temperature

By garikaib|2025-02-12T09:05:32+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Six's thermometer Six’s thermometer ZIMSEC O Level Geography Notes: Temperature

The daily maximum and minimum temperatures are measured using Six’s thermometer (pictured above).
It was invented by James Six a British scientist hence the name Six’s thermometer.
It is also known as the Maximum and Minimum thermometer.
It is housed in a Stevenson’s screen.
Diurnal […]

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The rain-shadow effect

By garikaib|2025-02-12T09:26:09+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Sem-arid conditions in Save Valley are due to the Rain-shadow effect. Image by Youth Delegates ZIMSEC O Level Geography Notes: Rain Shadow Effect

We have already looked at the formation of relief rainfall elsewhere. The […]

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Conservative zones/Transform faults

By garikaib|2025-02-12T09:19:46+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A conservative margin. Image by Expediatearcade. ZIMSEC O Level Geography Notes: Plate Tectonics: Transform Zones

At constructive zones plates slide sideways past each other.
In opposite directions in a tear or shear fashion.
At these margins lithosphere (land/oceanic crust) is neither created nor destroyed
That is neither plate is […]

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Physical weathering

By garikaib|2025-02-12T09:15:03+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Exfoliation weathering. Image credit asergeev.com ZIMSEC O Level Geography Notes: Physical Weathering

Physical weathering is the disintegration of a rock into smaller particles by mechanical processes and without any changes in the chemical composition of the rock.
It is more likely to occur in arid climates such […]

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Water Action in Deserts

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

Rain falling in a desert. Image credit Snipview.

In most deserts rain does not fall for several years.
When it does it comes in the form of unexpected and infrequent downpours.
Therefore despite the low rainfall totals (about 250mm per annum), water is […]

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Pot Holes

By garikaib|2025-02-12T09:36:01+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Potholes. Image credit thunderbolts.info Potholes. Image credit coolgeography.co.uk ZIMSEC O Level Geography Notes: Landforms resulting form Potholes

These are circular holes bored into the solid bedrock of a river by pebbles and stones carried by the river.
The rough river bed, mostly common in the upper course section or rivers, encourages turbulent […]

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February 2025