Landform Studies

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June 2015

People and Weathering

By |2017-01-17T11:22:06+02:00June 11th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Air pollution results in increased incidences of acid rain. Image credit airbetter.org

Air pollution results in increased incidences of acid rain. Image credit airbetter.org ZIMSEC O Level Geography Notes: People and weathering

How humans influence weather?

  • Human activities such as industrialisation  and driving of cars produce emissions such as sulphur dioxide,nitric oxide […]

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Limestone pavements

By |2017-01-17T11:22:07+02:00June 11th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Clints and grikes. Image credit nem.gov.uk.

Clints and grikes. Image credit nen.gov.uk. ZIMSEC O Level Geography Notes: Limestone pavements
  • Limestone pavements are flat areas of exposed limestone rocks.
  • They are part of the dissolved bedding plate which may have been exposed because the surface soil may have been removed by glacial activity […]

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Kopje, Tor and Balancing rocks

By |2017-01-17T11:22:08+02:00June 11th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A Kopje. Image credit MediaWiki.

A Kopje. Image credit MediaWiki. ZIMSEC O Level Geography Notes: Landforms resulting from Weathering: Kopjes

Tors/Kopjes/Castle kopjes

  • Tors/kopjes/castle kopjes are inselbergs.
  • Tors the same as kopjes even though some books make an attempt to distinguish between the two.
  • Different names are applied in different localities to what are essentially […]

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Dwala/Ruware/Whaleback

By |2017-01-17T11:22:09+02:00June 10th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Dwala/Ruware. Image credit WordPress.com

Dwala/Ruware. Image credit WordPress.com ZIMSEC O Level Geography Notes: Landforms resulting from weathering: Dwala
  • Known as ruware in Shona, dwala in Ndebele (Nguni languages) and whaleback in English.
  • An example is Domboshava where several such landforms can be found.
  • It is a hill or rock which is dome shaped and rises several metres […]

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Landforms resulting from weathering

By |2017-01-17T11:22:10+02:00June 10th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Ruware/Dwala. Image credit WordPress.com

Ruware/Dwala. Image credit WordPress.com ZIMSEC O Level Geography Notes: Landforms resulting from weathering.
  • Weathering processes and usually in conjunction with other denudation processes such as water and wind erosion and mass wasting results in the formation of various landscapes.
  • In temperate and tropical latitudes these include:

1.Inselbergs/Monadnocks

  • The […]

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Factors affecting weathering

By |2017-01-17T11:22:11+02:00June 10th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Weathered Limestone rocks. Image credit konfuciuszintezet.hu

Weathered Limestone rocks. Image credit konfuciuszintezet.hu ZIMSEC O Level Geography Notes: Factors affecting weathering.
  • The rate and prvailing type of weathering at any given place is affected by:
  1. Climate
  2. Relief
  3. Vegetation
  4. Rock type

Climate

  • Weathering types are distrubuted according to the prevailing climate of given areas especially when considering.
  • Temperature and rainfall […]

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Physical weathering

By |2017-01-17T11:22:12+02:00June 10th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Exfoliation weathering. Image credit asergeev.com

Exfoliation weathering. Image credit asergeev.com ZIMSEC O Level Geography Notes: Physical Weathering
  • Physical weathering is the disintegration of a rock into smaller particles by mechanical processes and without any changes in the chemical composition of the rock.
  • It is more likely to occur in arid climates such […]

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Chemical weathering

By |2017-01-17T11:22:13+02:00June 9th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Chemical weathering in a desert environment. Image credit Diffen.com

Chemical weathering in a desert environment. Image credit Diffen.com ZIMSEC O Level Geography Notes: Main types of weathering: Chemical weathering
  • Chemical weathering is the breaking down or decomposition of rocks as a result of various chemical processes and reactions altering the chemical […]

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Weathering

By |2017-01-17T11:22:14+02:00June 9th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A weathered boulder. Image credit earthlearningidea.

A weathered boulder. Image credit earthlearningidea. ZIMSEC O Level Geography Notes: Weathering
  • Earth movements (plate tectonics) create and lead to the development of the earth’s major landforms for example block mountains, volcanic cones, lava plateaus and rift valleys.
  • As soon as they are formed denudation processes […]

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The effects of earthquakes

By |2017-01-17T11:22:15+02:00June 9th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A tsunami in Miyako Japan 2011/Image credit Ibtimes.

A tsunami in Miyako Japan 2011/Image credit Ibtimes. ZIMSEC O Level Geography Notes: The effects of Earthquakes.

Factors that may affect the impact of earthquakes.

  • Distance of concerned area from epicenter although you should take note of the factor below.
  • Coastal locations have a higher risk […]

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