Hot Deserts Archives - Free ZIMSEC & Cambridge Revision Notes

Sand Dunes and Ripples

By garikaib|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 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 […]

Comments Off

Yardangs, Zeugens and Rock Pedestals

By garikaib|2022-09-15T12:44:14+02:00January 24th, 2023|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 […]

Comments Off

Inselbergs

By garikaib|2022-09-15T12:44:13+02:00January 24th, 2023|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 […]

Comments Off

Water Action in Deserts

By garikaib|2022-09-15T12:44:13+02:00January 24th, 2023|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 […]

Comments Off

Water in Hot Deserts

By garikaib|2022-09-15T12:44:12+02:00January 24th, 2023|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 […]

Comments Off

Wadis,Bahadas and the Desert Piedmont zone

By garikaib|2022-09-15T12:44:11+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Alluvial fan/Bajada/Bahada. Image credit MediaWiki ZIMSEC O Level Geography Notes: Wadis and Bahadas

Wadis/Canyons

As already pointed out freak storms occur in deserts characterised by excessive precipitation over short periods of time.
Due to infiltration excess flow and even saturation excess flow there is significant run off in the […]

Comments Off

Mesa and Butte

By garikaib|2022-09-15T12:44:12+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Messa (left) and Butte (right). Image credit channingchurch.com ZIMSEC O Level Geography Notes: Mesa and Butte

Mesas and buttes are flat topped uplands with steep sides and often capped by hard resistant rocks.
Mesas and buttes are desert features created primarily by river erosion […]

Comments Off

Playas

By garikaib|2022-09-15T12:44:11+02:00January 24th, 2023|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

A playa. Image credit bergoiata.com ZIMSEC O Level Geography Notes: Playas

These are sometimes known as inland drainage basins.
Due to the fact that there are no permanent drainage patterns in deserts any rain that falls either evaporates or infiltrates into the soil or runs off and […]

Comments Off

Human activities in deserts

By garikaib|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 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 […]

Comments Off

Desertfication

By garikaib|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. 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 […]

Comments Off

January 2023