o level geography notes Archives - Page 2 of 7 - Free ZIMSEC & Cambridge Revision Notes

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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Ox-bow lakes

By garikaib|2025-02-12T09:45:54+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Ox-bow lake. Image credit airphotona.com ZIMSEC O Level Geography Notes: Ox-bow lakes

An oxbow lake is a U-shaped body of water that forms when a wide meander from the main stem of a river is cut off, creating a free-standing body of water.
This landform is […]

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Depressions

By garikaib|2025-02-12T09:22:22+02:00February 12th, 2025|O Level Geography, Weather and Climate|

The characteristics and weather pattern associated with a depression. Image by the BBC. ZIMSEC O Level Geography Notes.

Characteristics

This is an area of low pressure whose shape on a map is oval or circular.
It is represented […]

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Advantages of Rift Valleys and Block Mountains

By garikaib|2025-02-12T09:36:35+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Yosemite Mountains and Valley. Image by Mountainprofessor. ZIMSEC O Level Geography Notes: Advantages of Rift Valleys and Block Mountains

Advantages of block mountains

Relief rainfall is common raising the amount of annual precipitation within the vicinity of such mountains.
They have a cooler environments which invigorating tends to […]

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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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Waterfalls and Rapids

By garikaib|2025-02-12T08:59:30+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

The Victoria Falls formed by water falling into a faultline. Image credit trekearth.com ZIMSEC O Level Geography Notes: Waterfalls and Rapids

Waterfalls and Rapids

Waterfalls commonly occur in the upper course section of the river although they can occur […]

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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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Vulcanicity

By garikaib|2025-02-12T09:37:43+02:00February 12th, 2025|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Violent volcanic eruption. Image via Dailymail. ZIMSEC O Level Geography Notes: Vulcanicity

Vulcanicity refers to all the various way by which molten rock and gasses are forced into the earths and onto its surface.
It includes volcanic eruptions which lead to the formation of volcanoes, lava plateaus and geysers.
It […]

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Sand Dunes and Ripples

By garikaib|2025-02-12T09:42:27+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Seif dunes. Image credit 7-themes.com ZIMSEC O Level Geography Notes: Sand Dunes

As soon as wind velocity drops wind deposition occurs.
The heaviest material is deposited first while the finer material and dust is carried further before being dropped.
As a result loess (which consists of fine particles) is sometimes […]

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