Hot Deserts Archives - Free ZIMSEC & Cambridge Revision Notes

Location and Causes of Hot Deserts

By garikaib|2025-02-12T09:31:05+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

A map showing the location of the world’s major deserts. Image credit English-Online.net ZIMSEC O Level Geography Notes: Location of Hot Deserts.

The largest arid and semi-arid deserts occur between latitudes 15° and 30° North and South of […]

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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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Wind Action: Wind Erosion

By garikaib|2025-02-12T09:35:25+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Wind carved flints stones in a desert. Image credit asergeev.com ZIMSEC O Level Geography Notes: Wind Action in Deserts

Wind is a process where the wind detaches soil particles from the land surface and transports them by its force.
It occurs when […]

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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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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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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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Yardangs, Zeugens and Rock Pedestals

By garikaib|2025-02-12T08:56:37+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Zeugens. Image credit Revisionworld.com ZIMSEC O Level Geography Notes: Hot Deserts: Yardangs

Zeugens

Pictured in the diagram above.
Zeugens are the ridges in “ridge and furrow” landscapes found in deserts.
These ridge and furrow landscapes sculpted found in hot deserts are a result of wind erosion.
Wind abrasion turns a desert surface […]

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Inselbergs

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

An inselberg in the Namib Desert. Image credit MediaWiki. ZIMSEC O Level Geography Notes: Hot Deserts: Inselbergs

These are round topped mounds of rock found in deserts as a result of persistant wind erosion over long periods of time.
In some deserts 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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Water in Hot Deserts

By garikaib|2025-02-12T09:03:51+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Flash floods in a desert. Image credit Backroadswest.com ZIMSEC O Level Geography Notes: Water in Hot Deserts

Water action in deserts can be divided into three:
freak storms or rain that falls sometimes in semi-arid regions,
dew which plays formed as a result of temperatures […]

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February 2025