January 2023

Human activities in deserts

By |2022-09-15T12:44:10+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Oil drilling in a desert. Image credit Foxoildrilling.com

Oil drilling in a desert. Image credit Foxoildrilling.com ZIMSEC O Level Geography Notes: Human Activities in Deserts
  • In spite of their hostile enviroments brought about by aridity leading to shortage of water, pasture, wood fuel and other wood resources, remoteness, infertile and salty […]

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Desertfication

By |2022-09-15T12:44:10+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Desertification in the arid parts of Kenya. image credit Rascona-of-the-week.

Desertification in the arid parts of Kenya. image credit Rascona-of-the-week. ZIMSEC O Level Geography Notes: Desertification

The meaning of desertification

  • Desertification literary means the making of deserts and several definitions have been offered for the term all expressing this idea.
  • Desertification refers to […]

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Characteristics of Hot Deserts

By |2022-09-15T12:44:18+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Kalahari Desert. Image credit HDImageLib

Kalahari Desert. Image credit HDImageLib ZIMSEC O Level Geography Notes:Characteristics and Location of Hot deser

NB:It is important to note that the Ordinary Level syllabus confines our study to hot deserts that are otherwise known as tropical deserts. Other deserts such as the cold deserts of […]


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Methods of preventing desertification

By |2022-09-15T12:44:09+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Badia Dam in the midst of a desert. Image credit Broadleap.org.

Badia Dam in the midst of a desert. Image credit Broadleap.org. ZIMSEC O Level Geography Notes: Methods of preventing desertification.

The following methods can be used to prevent and slow down the rate of desertification:

  • Afforestation that is planting trees where […]

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Location and Causes of Hot Deserts

By |2022-09-15T12:44:17+02:00January 24th, 2023|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

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 |2022-09-15T12:44:17+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

A sandstorm in a desert. Image credit

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 |2022-09-15T12:44:16+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Wind carved flints stones in a desert. Image credit asergeev.com

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 |2022-09-15T12:44:16+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Wind transportation methods. Image credit apod.com

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 |2022-09-15T12:44:15+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Deflation Hollow. Image via Imgkid

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 |2022-09-15T12:44:15+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Seif dunes. Image credit 7-themes.com

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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