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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February 2025
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 […]
The internal structure of the earth
A cutaway showing the internal structure of the earth. Image by Teachastronomy. ZIMSEC O Level Geography Notes: The Internal Structure of the Earth
- The internal structure of the earth is the foundaiton upon which the external landforms on the earth’s […]
Benefits and Problems of Volcanoes
Fertile volcanic soil Kenya. Image credit tishaferral.com ZIMSEC O Level Geography Notes: Benefits and Problems of Volcanoes
Benefits of volcanoes to humans
- They eject lava and ash which in turn produce very fertile soils which boost agriculture activities.
- Volcanoes and areas near them can […]
Wind Action in Deserts: Wind Transport and Deposition
Wind transportation methods. Image credit apod.com ZIMSEC O Level Geography Notes: Wind Action in Deserts: Wind Transport
- Wind is able to transport (move) sand and dust particles depending on its speed and flow.
- The effectiveness of wind erosion and transport depend on a number of factors:
- Aeolian […]
River Deposition
River deposition (left bank). Image credit Panoramio. ZIMSEC O Level Geography Notes: River deposition
- Deposition occurs when a river no longer as sufficient energy to transport its load.
- When its velocity begins to fall and has less energy, a river’s competence (maximum size of material […]
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 […]
Sea Transport
An ocean bulk carrier. Image credit malaquaylogistics.com ZIMSEC O Level Geography Notes: Transport: Sea Transport
Advantages
- Is relatively cheaper.
- Caries bulky goods at once
- They are very comfortable for example cruise ships and ocean liners are often fitted with luxury facilities such as bathrooms, toilets, casinos and […]
Effects of urbanization
Illegal houses being demolished in Epworth, Harare. Image credit voicesofafrica.co.za ZIMSEC O Level Geography Notes: Settlements:The benefits and problems of urbanisation
- Urbanisation brings about certain effects
- There negative and positive effects
- These effects affect both the source (rural areas) and receiving areas (the […]
Population growth
ZIMSEC O Level Geography Notes: Population: Population growth
- is an increase in the number of people that reside in a country, state, county, or city
- There are several factors which affect the growth of a population
- A country’s population grows as a result of natural births taking place within the community/country/region
- Births increase the population
- It can also grow […]