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 […]
February 2025
Vulcanicity
Violent volcanic eruption. Image via Dailymail. ZIMSEC O Level Geography Notes: Vulcanicity
- Vulcanicity refers to all the various way by which molten rock and gasses are forced into the earths and onto its surface.
- It includes volcanic eruptions which lead to the formation of volcanoes, lava plateaus and geysers.
- It […]
Sand Dunes and Ripples
Seif dunes. Image credit 7-themes.com ZIMSEC O Level Geography Notes: Sand Dunes
- As soon as wind velocity drops wind deposition occurs.
- The heaviest material is deposited first while the finer material and dust is carried further before being dropped.
- As a result loess (which consists of fine particles) is sometimes […]
A satellite photo of the Nile Delta. Image creditCyclones
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 […]
Landforms resulting from intrusive vulcanicity
Some of the landforms resulting from intrusive vulcanicity. Image by Msnucleus.org ZIMSEC O Level Geography Notes: Landforms resulting form intrusive vulcanicity
Intrusive vulcanicity is the movement of gasses, magma and other materials into the earth’s curst to form interior volcanic […]
Inselbergs
An inselberg in the Namib Desert. Image credit MediaWiki. ZIMSEC O Level Geography Notes: Hot Deserts: Inselbergs
- These are round topped mounds of rock found in deserts as a result of persistant wind erosion over long periods of time.
- In some deserts such […]
River Regime
The river Nile. Image credit historymuseum.ca ZIMSEC O Level Geography Notes: River Regime
- A river regime is the term used to describe the annual variations in a specified river’s discharge.
- A river’s discharge is the volume of water flowing through a river channel.
- This is the total […]
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 […]
Lava Plateaus
Fissure eruptions at Mt Nyiragongo. Image credit Imgsoup. ZIMSEC O Level Geography Notes: Lava Plateaus
- Lava eruptions through narrow cracks (fissures) tends to be very quiet and subdued.
- The lava spreads out over the surrounding countryside.
- Successive lava outpourings causes successive layers of lava to […]