O Level Science Notes

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September 2016

Managing Ecosystems

By |2017-01-17T11:11:10+02:00September 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

The savannah. Image credit wildnatureinstitute.org

The savannah. Image credit wildnatureinstitute.org ZIMSEC O Level Combined Science Notes: Managing Ecosystems
  • The ecosystem needs to looked after to ensure it is in balance
  • Humans can have good or bad effects on the ecosystem
  • Soil is an especially important component of the Zimbabwean ecosystem because […]
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Protecting Water supplies

By |2017-01-17T11:11:11+02:00September 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

A protected well. Image credit totallandcare.org

A protected well. Image credit totallandcare.org ZIMSEC O Level Combined Science Notes: Testing the purity of water
  • Most rural areas do not have access to running tap water
  • Their water comes from various sources including dams, wells, boreholes, springs
  • Some of these sources are produce […]
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The purification of Water

By |2017-01-17T11:11:13+02:00September 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Water Purification Plant. Image credit cdrmaguire.com

Water Purification Plant. Image credit cdrmaguire.com ZIMSEC O Level Combined Science Notes: The purification of Water
  • Large residential areas such as Harare, Chitungwiza and other urban establishments are supplied with piped running water
  • This water is treated so that it is safe to drink and […]
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Environmental Health: Air pollution

By |2017-01-17T11:11:14+02:00September 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Smog in China. Image credit ctvnews.ca

Smog in China. Image credit ctvnews.ca ZIMSEC O Level Combined Science Notes: Environmental Health: Air pollution
  • Urban and industrial areas in Zimbabwe produce waste gases which enter the atmosphere
  • Often these gases are toxic and contain a high level of smoke particles
  • A thick haze […]
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Centralised Sewage Treatment Works

By |2017-01-17T11:11:15+02:00September 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Sewage treatment works at Morton Jaffray,Harare. Image credit hararenews.co.zw

Sewage treatment works at Morton Jaffray,Harare. Image credit hararenews.co.zw ZIMSEC O Level Combined Science Notes: Centralised Sewage Treatment Works
  • Are used to collect and treat sewage waste from large industrial and residential areas
  • They treat large quantities of human waste
  • The raw […]
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