January 2023

Floods

By |2022-09-15T12:44:38+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

Floods in OZ. Image by Time.

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 […]

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Frost/Snow and Hail

By |2022-09-15T12:44:38+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

A house and vehicle covered in snow. Image by Novinite.

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 […]

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Pressure systems

By |2022-09-15T12:44:54+02:00January 24th, 2023|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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Introduction to weather and climate

By |2022-09-15T12:44:59+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Rainy Weather. Image by Sodahead.

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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Temperature

By |2022-09-15T12:44:58+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Six's thermometer

Six’s thermometer ZIMSEC O Level Geography Notes: Temperature
  • The daily maximum and minimum temperatures are measured using Six’s thermometer (pictured above).
  • It was invented by James Six a British scientist hence the name Six’s thermometer.
  • It is also known as the Maximum and Minimum thermometer.
  • It is housed in a Stevenson’s screen.
  • Diurnal […]

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Stevenson’s screen

By |2022-09-15T12:44:58+02:00January 24th, 2023|O Level Geography, Weather and Climate|

An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign.

An open Stevenson screen showing the instruments it houses. Image by Hubhomedesign. ZIMSEC O Level Geography Notes: Stevenson Screen

A Stevenson screen is a prominent feature on most weather stations.

  • It is used to house weather instruments, for example the […]

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Humidity

By |2022-09-15T12:44:57+02:00January 24th, 2023|O Level Geography, Weather and Climate|

Wet and dry bulb thermometer. Image by TradeIndia

Wet and dry bulb thermometer. Image by TradeIndia ZIMSEC O Level Geography Notes: Humidity

-a quantity representing the amount of water vapor in the atmosphere.

  • It is measured using a hydrometer.
  • The wet and dry bulb thermometer is also known as a psychrometer.
  • Weather satellites can […]

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Wind direction and speed

By |2022-09-15T12:44:56+02:00January 24th, 2023|O Level Geography, Weather and Climate|

A cup anemometer and windvane. Image by Noaa.gov.

A cup anemometer and windvane. Image by Noaa.gov. ZIMSEC O Level Geography Notes: Wind direction and speed.

Wind is the movement of air across the earth’s surface due to differences in pressure between two regions. Air moves from high pressure regions to low […]


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Sunshine

By |2022-09-15T12:44:55+02:00January 24th, 2023|O Level Geography, Weather and Climate|

A sunshine recorder. Image by Rfuess-Mueller.

A sunshine recorder. Image by Rfuess-Mueller. ZIMSEC O Level Geography Notes: Sunshine
  • It has a glass sphere surrounded by a metal frame.
  • On the frame is attached a sensitive card.
  • The sphere focuses the sun’s rays onto the card.
  • As the sun moves across the sky it burns […]

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