June 2015

Methods of preventing desertification

By |2017-01-17T11:21:52+02:00June 16th, 2015|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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Human activities in deserts

By |2017-01-17T11:21:53+02:00June 16th, 2015|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 |2017-01-17T11:21:54+02:00June 16th, 2015|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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Wadis,Bahadas and the Desert Piedmont zone

By |2017-01-17T11:21:54+02:00June 15th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Alluvial fan/Bajada/Bahada. Image credit MediaWiki

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 […]

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Playas

By |2017-01-17T11:21:55+02:00June 15th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

A playa. Image credit bergoiata.com

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 […]

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Mesa and Butte

By |2017-01-17T11:21:56+02:00June 15th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Messa (left) and Butte (right). Image credit channingchurch.com

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 […]

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Water in Hot Deserts

By |2017-01-17T11:21:57+02:00June 15th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Flash floods in a desert. Image credit Backroadswest.com

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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Water Action in Deserts

By |2017-07-13T08:59:05+02:00June 15th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Rain falling in a desert. Image credit Snipview.

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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Inselbergs

By |2017-01-17T11:21:59+02:00June 14th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

An inselberg in the Namib Desert. Image credit MediaWiki.

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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Yardangs, Zeugens and Rock Pedestals

By |2017-01-17T11:21:59+02:00June 14th, 2015|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Zeugens. Image credit Revisionworld.com

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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