February 2025

Ocean currents and the fishing industry

By |2025-02-12T09:11:44+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Ocean currents of the world. Image credit Pearson

ZIMSEC O Level Geography Notes: Natural Resources: Fishing:Ocean currents and the fishing industry

  • Ocean currents are important in the fishing industry as they affect the growth of plankton which provides fish food.
  • Warm ocean currents restrict the growth of plankton hence give rise […]
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Thermal Power: Locational Factors

By |2025-02-12T09:34:28+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Cooling towers. Hwange Thermal. Image credit esi-africa.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Thermal Power: Location Factors

Fuel source

  • Thermal power stations cab be located at the fuel source.
  • This is if the fuel is difficult to transport.
  • For example Hwange Thermal Power station is located at the coal fields.
  • The […]
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Advantages and Disadvantages of Nuclear power as a source of energy

By |2025-02-12T09:00:19+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes|

Nuclear Power Plant. Image credit drug-alcoholtesting.co.uk

ZIMSEC O Level Geography Notes: Natural Resources: Energy: Advantages and Disadvantages of Nuclear power as a source of energy

Advantages

  • Very long lifespan as half-life of most radioactive substances is about 4 000 years.
  • Has very high energy output.
  • Very efficient energy source.
  • Relatively clean if […]
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Introduction to weather and climate

By |2025-02-12T08:59:57+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Rainy Weather. Image by Sodahead. Rainy Weather. Image by Sodahead. ZIMSEC O Level Geography Notes: Introduction to Weather and Climate

Weather-the state of the atmosphere at a particular place and time as regards heat, cloudiness, dryness, sunshine, wind, rain, etc. The weather is all around us, all the time. It is an […]

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Convergence and collision zones/plates

By |2025-02-12T09:16:29+02:00February 12th, 2025|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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Weathering

By |2025-02-12T09:10:34+02:00February 12th, 2025|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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Yardangs, Zeugens and Rock Pedestals

By |2025-02-12T08:56:37+02:00February 12th, 2025|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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Landforms resulting form river processes

By |2025-02-12T09:32:44+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Rapids near Niagara Falls. Image credit NiagaraFallsLive.com Rapids near Niagara Falls. Image credit NiagaraFallsLive.com ZIMSEC Geography Notes: Landforms resulting from river processes

  • A river through its processes of erosion, transportation and deposition forms several landforms.
  • These can be broadly divided into those landforms resulting from erosion and deposition.

Landforms […]

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River capture

By |2025-02-12T09:02:51+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

River capture. River capture. ZIMSEC O Level Geography Notes: River capture

  • This is a process where one River captures the headwaters on a nearby stream.
  • This can occur due to several reasons viz:
  • Tectonic earth movements, where the slope of the land changes, and the stream is tipped out of its former course.
  • Natural damming, […]
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