May 2015

Frost/Snow and Hail

By |2017-01-17T11:22:34+02:00May 30th, 2015|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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Floods

By |2017-01-17T11:22:35+02:00May 30th, 2015|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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Lightining

By |2017-01-17T11:22:36+02:00May 30th, 2015|Notes, Weather and Climate|

Lightining. Image by GreenSociety.

Lightining. Image by GreenSociety. ZIMSEC O Level Geography Notes: Weather Hazards: Lightining
  • Is typically caused by the physical characteristics of cumulonimbus weather conditions.
  • As rain drops fall the energy which they have causes a positive charge to develop at the top of a cloud and negative charges to develop […]

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Weather Hazards

By |2017-01-17T11:22:36+02:00May 30th, 2015|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

Floods are just one of many natural weather hazards. Image by The Australian.

Floods are just one of many natural weather hazards. Image by The Australian. ZIMSEC O Level Geography Notes: Weather Hazards
  • Weather hazards are conditions which are unfavorable to people and their activities that result from weather phenomena.
  • There are […]

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Weather symbols/ Synoptic Charts

By |2017-01-17T11:22:43+02:00May 25th, 2015|O Level Geography, Weather and Climate|

weather-min

ZIMSEC O Level Geography Notes: Weather Symbols and Synoptic Charts

  • After weather measurements have been taken at weather stations
  • they are then plotted onto synoptic charts.
  • These charts make use of special symbols as a form of pre-agreed shorthand that is used to show the weather conditions at a given place at a […]

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Prevailing Winds in Southern Africa

By |2017-01-17T11:22:44+02:00May 25th, 2015|O Level Geography, Weather and Climate|

The Harmattan

The Harmattan. Image by  Kafkaesqublog ZIMSEC O Level Geography Notes: Prevailing Winds in Southern Africa
  • The eastern parts of Zimbabwe about 200km from the port of Beira and on average Zimbabwe is about 400km from the Indian Ocean, the closest ocean to the country.
  • Due to its proximity to the […]

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Convectional rainfall

By |2017-01-17T11:22:46+02:00May 22nd, 2015|O Level Geography, Weather and Climate|

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi

Convectional Rainfall commonly occurs in rainforests. Image by Wallpaperlepi ZIMSEC O Level Geography Notes: Convectional Rainfall
  • This is the main type of rainfall in the humid tropics such as the Amazon and Congo rain forests.
  • Occurs when the ground surface is locally […]

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Pressure systems

By |2017-01-17T11:22:52+02:00May 19th, 2015|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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Sunshine

By |2017-01-17T11:22:53+02:00May 19th, 2015|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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