June 2015

Faulting

By |2017-01-17T11:22:26+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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Land-forms resulting from folding

By |2017-01-17T11:22:26+02:00June 3rd, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

The fold mountains of the Cape are among the most prominent features of folding. Image via AfricanSky.

The fold mountains of the Cape are among the most prominent features of folding. Image via AfricanSky.

Land-forms resulting from folding

Several landforms are formed during the folding process including:

  1. Anticlines
  2. Nappe fold
  3. Overthrust
  4. Overfold
  5. Recumbent
  6. Fold mountains

1. Anticline


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Folding

By |2017-01-17T11:22:27+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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Conservative zones/Transform faults

By |2017-01-17T11:22:28+02:00June 1st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A conservative margin. Image by Expediatearcade.

A conservative margin. Image by Expediatearcade. ZIMSEC O Level Geography Notes: Plate Tectonics: Transform Zones
  • At constructive zones plates slide sideways past each other.
  • In opposite directions in a tear or shear fashion.
  • At these margins lithosphere (land/oceanic crust) is neither created nor destroyed
  • That is neither plate is […]

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Divergence/Constructive zone/plates

By |2017-01-17T11:22:29+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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Plate tectonics

By |2017-06-16T17:26:25+02:00June 1st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Major Plates of the world. Image by Learner.org

Major Plates of the world. Image by Learner.org ZIMSEC O Level Geography Notes: Plate Tectonics
  • The lithosphere (that is the earth’s crust and the rigid part of the mantle) is divided into seven large and several smaller plates.
  • A plate is a rock that is found […]

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Convergence and collision zones/plates

By |2017-01-17T11:22:30+02:00June 1st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Convergence zone. Image by Coft.edu

Convergence zone. Image by Coft.edu ZIMSEC O Level Geography Notes: Plate tectonics: Convergence Zone.

Convergence zone

  • Are also know as destructive plates (zones) or the zone of subduction.
  • This is when two plates move towards each other as shown on the diagram above.
  • An Ocean crust moves towards a […]

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May 2015

The theory of continental drift

By |2017-01-17T11:22:31+02:00May 31st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Evedence for the continental drift. Image by Wiki Commons.

Evidence for the continental drift. Image by Wiki Commons. ZIMSEC O Level Geography Notes: The theory of continental drift
  • The theory of or idea that present day continents were once one single continent.
  • Continental drifts refers to the movement of continents.
  • The theory says that […]

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The internal structure of the earth

By |2017-01-17T11:22:32+02:00May 31st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

A cutaway showing the internal structure of the earth. Image by Teachastronomy.

A cutaway showing the internal structure of the earth. Image by Teachastronomy. ZIMSEC O Level Geography Notes: The Internal Structure of the Earth
  • The internal structure of the earth is the foundaiton upon which the external landforms on the earth’s […]

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The earth’s crust

By |2017-01-17T11:22:33+02:00May 31st, 2015|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

The structure of the Earth. Image by BBC.

The structure of the Earth. Image by BBC. ZIMSEC O Level Geography Notes: The Earth’s Crust
  • The earth is generally spherical in shape.
  • It’s surface however is made up of immeasurable valleys, mountains, rivers, hills etc of different shapes and sizes which in turn […]

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