Landform Studies Archives - Free ZIMSEC & Cambridge Revision Notes

Plate tectonics

By garikaib|2022-09-15T12:44:34+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Earthquakes and their causes

By garikaib|2022-09-15T12:44:25+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

Destruction wreaked by an earthquake. Image credit Telegraph.co.uk ZIMSEC O Level Geography Notes: Earthquakes and their causes

An earthquake is a shaking, vibration, trembling or movement in the earth’s crust.
They are caused by one tectonic plate sliding over or past another plate along […]

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Convergence and collision zones/plates

By garikaib|2022-09-15T12:44:35+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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The effects of earthquakes

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

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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Divergence/Constructive zone/plates

By garikaib|2022-09-15T12:44:34+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Weathering

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

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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Conservative zones/Transform faults

By garikaib|2022-09-15T12:44:33+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Chemical weathering

By garikaib|2022-09-15T12:44:23+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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Folding

By garikaib|2022-09-15T12:44:32+02:00January 24th, 2023|Landform Studies, Notes, Ordinary Level Notes|

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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Physical weathering

By garikaib|2022-09-15T12:44:22+02:00January 24th, 2023|Landform Studies, Notes, O Level Geography, Ordinary Level Notes|

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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January 2023