January 2023

Unintentional changes to weather

By |2022-09-15T12:44:41+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes, Weather and Climate|

ZIMSEC O Level Geography Notes: People and Weather: Accidental Changes

Acid Rain

  • The smoke from burning fuels and chemical industries rises into the air and mixes with water vapour.
  • When the rain falls down it becomes acidic.
  • The acid rain is a weak acid made up of sulphuric and nitric acids.
  • Over, a long time (years for example), the rain […]
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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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Lightining

By |2022-09-15T12:44:39+02:00January 24th, 2023|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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Depressions

By |2022-09-15T12:44:52+02:00January 24th, 2023|O Level Geography, Weather and Climate|

The characteristics and weather pattern associated with a depression. Image by the BBC. 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 […]
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