o level geography notes Archives - Page 4 of 7 - Free ZIMSEC & Cambridge Revision Notes

The effects of earthquakes

By garikaib|2025-02-12T09:08:11+02:00February 12th, 2025|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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Mesa and Butte

By garikaib|2025-02-12T09:06:32+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

Messa (left) and Butte (right). Image credit channingchurch.com ZIMSEC O Level Geography Notes: Mesa and Butte

Mesas and buttes are flat topped uplands with steep sides and often capped by hard resistant rocks.
Mesas and buttes are desert features created primarily by river erosion […]

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Surface Water flow and the origin of rivers

By garikaib|2025-02-12T08:58:40+02:00February 12th, 2025|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Natural Springs contribute their water to rivers and often form the source of rivers. Image credit paintballfun.com ZIMSEC O Level Geography Notes: Surface Water Flow and the Origin of rivers

Surface water flow and […]

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Pressure systems

By garikaib|2025-02-12T09:10:04+02:00February 12th, 2025|O Level Geography, Weather and Climate|

The world's pressure belts The world’s pressure belts and winds ZIMSEC O Level Geography Notes: Pressure

Pressure

Air has weight and therefore exerts pressure, called atmospheric pressure onto the earth’s surface.
The pressure is not the same for all regions nor is it the same for any one region all the time that […]

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The rain-shadow effect

By garikaib|2025-02-12T09:26:09+02:00February 12th, 2025|O Level Geography, Weather and Climate|

Sem-arid conditions in Save Valley are due to the Rain-shadow effect. Image by Youth Delegates ZIMSEC O Level Geography Notes: Rain Shadow Effect

We have already looked at the formation of relief rainfall elsewhere. The […]

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Weathering

By garikaib|2025-02-12T09:10:34+02:00February 12th, 2025|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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Playas

By garikaib|2025-02-12T09:07:39+02:00February 12th, 2025|Hot Deserts, Notes, O Level Geography, Ordinary Level Notes|

A playa. Image credit bergoiata.com ZIMSEC O Level Geography Notes: Playas

These are sometimes known as inland drainage basins.
Due to the fact that there are no permanent drainage patterns in deserts any rain that falls either evaporates or infiltrates into the soil or runs off and […]

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River capture

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

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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Introduction to weather and climate

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

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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Lightining

By garikaib|2025-02-12T09:01:14+02:00February 12th, 2025|Notes, Weather and Climate|

Lightining. Image by GreenSociety. ZIMSEC O Level Geography Notes: Weather Hazards: Lightining

Is typically caused by the physical characteristics of cumulonimbus weather conditions.
As rain drops fall the energy which they have causes a positive charge to develop at the top of a cloud and negative charges to develop […]

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February 2025