June 2015

Landforms resulting from weathering

By |2022-09-15T12:44:21+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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Weathering

By |2022-09-15T12:44:24+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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Lava Plateaus

By |2022-09-15T12:44:27+02:00June 8th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup.

Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup. ZIMSEC O Level Geography Notes: Lava Plateaus
  • Lava eruptions through narrow cracks (fissures) tends to be very quiet and subdued.
  • The lava spreads out over the surrounding countryside.
  • Successive lava outpourings causes successive layers of lava to […]

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Calderas

By |2022-09-15T12:44:27+02:00June 8th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

El Boqueron caldera in El Salvador. Image credit Wikispaces.com

El Boqueron caldera in El Salvador. Image credit Wikispaces.com ZIMSEC O Level Geography Notes: Calderas
  • Calderas are very large craters often two or more kilometers in diameter that form at the top of volcanoes.
  • They are often deep extending downwards for a few hundred […]

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Landforms resulting from intrusive vulcanicity

By |2022-09-15T12:44:28+02:00June 6th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Some of the landforms resulting from intrusive vulcanicity. Image by Msneucleus.org

Some of the landforms resulting from intrusive vulcanicity. Image by Msnucleus.org ZIMSEC O Level Geography Notes: Landforms resulting form intrusive vulcanicity

Intrusive vulcanicity is the movement of gasses, magma and other materials into the earth’s curst to form interior volcanic […]


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Vulcanicity

By |2022-09-15T12:44:29+02:00June 6th, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Violent volcanic eruption. Image by Dailymail.

Violent volcanic eruption. Image via Dailymail. ZIMSEC O Level Geography Notes: Vulcanicity
  • Vulcanicity refers to all the various way by which molten rock and gasses are forced into the earths and onto its surface.
  • It includes volcanic eruptions which lead to the formation of volcanoes, lava plateaus and geysers.
  • It […]

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Landforms resulting from faulting

By |2022-09-15T12:44:30+02:00June 4th, 2015|Landform Studies, Notes, O Level Geography|

The Great African Rift Valley. Image by Mamonthsafaris.

The Great African Rift Valley. Image by Mamonthsafaris. ZIMSEC O Level Geography Notes: Landfroms resulting from faulting.

Major landforms that result from faulting include:

  1. Block Mountains
  2. Rift valleys
  3. Tilted blocks.

1. Block Mountains The formation of block-mountains (Horst). Image by WikiComons


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Faulting

By |2022-09-15T12:44:31+02:00June 4th, 2015|Landform Studies, Notes, O Level Geography|

Common types of faults.

Common types of faults. Image via Noaa.gov ZIMSEC O Level Geography Notes: Faulting.
  • Lateral earth movements often produce very great stresses due to compressional forces (when plates move towards one another) and tensional forces (pulling apart).
  • These forces can cause fractures or breaks in the earth’s crust.
  • When breaks […]

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Folding

By |2022-09-15T12:44:32+02:00June 3rd, 2015|Landform Studies, Notes, Ordinary Level Notes|

Simple Folding. Image by Pixshark.

Simple Folding. Image by Pixshark. ZIMSEC O Level Geography: Folding
  • Tectonic movements are those movements that result from the earth’s internal forces.
  • When forces move horizontally towards one another they are known as compressional.
  • Rocks that make up the earth’s crust are subjected to these compressional forces in a […]

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Divergence/Constructive zone/plates

By |2022-09-15T12:44:34+02:00June 1st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Divergent plates. Image by Cornel.

Divergent plates. Image by Cornel. ZIMSEC O Level Geography Notes: Plate Tectonics: Convergence Plates
  • In a divergence zone plates move away from one another thus the name “divergence.”
  • Magma up-wells from the mantle to fill the gap left by the diverging plates.
  • The magma provides new material to form […]

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