Depressions
The characteristics and weather pattern associated with a depression. Image by the BBC. ZIMSEC O Level Geography Notes.
Characteristics
- This is an area of low pressure whose shape on a map is oval or circular.
- It is represented […]
February 2025
Floods
Floods in OZ. Image by Time. ZIMSEC O Level Geography Notes: Weather Hazards: Floods.
- Some parts of Zimbabwe especially low lying areas like Muzarabani. The Tokwe-Mukosi area near Masvingo experienced severe floods in the 2014/15 rain season leaving a lot of homes destroyed and people […]
Anticyclones
Pictures showing wind direction in an anti-cylcone (right) in both the southern and nothern hemisphere. Image by Physical Geography ZIMSEC O Level Geography Notes: Anticyclones.
Features of anticyclones.
- These are areas of high […]
Frost/Snow and Hail
A house and vehicle covered in snow. Image by Novinite. ZIMSEC O Level Geography Notes: Frost/Snow and Hail.
Snow/Frost
- Caused by a sudden fall or drop in temperature.
- With snow ice crystals are formed in the atmosphere.
- When these small ice crystals collide with […]
Cyclones
The formation of a cyclone. Image via Imagarcade. ZIMSEC O Level Geography Notes: Cyclones
Features of a cyclone.
- These are systems of intense low pressure.
- There are sometimes known as hurricanes (the U.S and the American continents) and typhoons( in Asian countries).
- On a map the […]
Drought
Drought stressed maize. Image by Missouri.edu ZIMSEC O Level Geography Notes: Weather Hazards: Drought
- In general terms drought is caused by a general shortage of precipitation over an extended period of time usually the rain season resulting in water shortages for both human and natural […]
Rainfall
Rainfall. Image via the Herald. ZIMSEC O Level Geography Notes: Rainfall.
- Rainfall is just one form of precipitation.
- Precipitation occurs when warm moist air rises or is forced to rise.
- Water vapor in the air parcel cools and condenses to form clouds.
- This is because temperature falls with increase […]
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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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: […]
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 […]