Orographic/Relief Rainfall
Aberfoyle Tea Estate in the Honde Valley Eastern Highlands is one of the places that receive a lot of Relief rainfall. Image Credit Buckinghambirding. ZIMSEC O Level Geography Notes: […]
February 2025
Earthquakes and their causes
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 […]
Wadis,Bahadas and the Desert Piedmont zone
Alluvial fan/Bajada/Bahada. Image credit MediaWiki ZIMSEC O Level Geography Notes: Wadis and Bahadas
Wadis/Canyons
- As already pointed out freak storms occur in deserts characterised by excessive precipitation over short periods of time.
- Due to infiltration excess flow and even saturation excess flow there is significant run off in the […]
Drainage Basin
The drainage basin. Image credit BBC. ZIMSEC O Level Geography Notes: Drainage Basin
- The term drainage basin refers to an area of land drained by a river and its tributaries (river system).
- It includes water found in the water table and surface run-off.
- The drainage basin is also known […]
Frontal Systems
Weather on a Front. Image by DiyMid. ZIMSEC O Level Geography Notes: Fronts
Fronts
-A front is a boundary between two air masses. Fronts are classified and named according to which air mass is replacing the other.
Warm Front ![A [...]
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Convectional rainfall
Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi ZIMSEC O Level Geography Notes: Convectional Rainfall
The effects of earthquakes
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 […]
Mesa and Butte
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 […]
Surface Water flow and the origin of rivers
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 […]
Pressure systems
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 […]