January 2023

Advantages and Disadvantages of Nuclear power as a source of energy

By |2022-09-15T12:34:22+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Nuclear Power Plant. Image credit drug-alcoholtesting.co.uk

ZIMSEC O Level Geography Notes: Natural Resources: Energy: Advantages and Disadvantages of Nuclear power as a source of energy

Advantages

  • Very long lifespan as half-life of most radioactive substances is about 4 000 years.
  • Has very high energy output.
  • Very efficient energy source.
  • Relatively clean if […]
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Oil in Nigeria:Benefits, drawbacks, problems of oil extraction

By |2022-09-15T12:35:23+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

An oil spill in Nigeria. Image credit huffingtonpost.com

ZIMSEC O Level Geography Notes: Natural Resources: Oil in Nigeria:Problems of oil extraction

The following are problem associated with oil extractions:

  • Hot humid equatorial climate is associated with high incidence of environmental diseases.
  • High temperatures reduce the capability of to work.
  • Slippery and unstable […]
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Exotic commercial forests

By |2022-09-15T12:35:12+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Pine tree forest. Image credit nyobain.com

ZIMSEC O Level Geography Notes: Natural Resources: Forestry in Zimbabwe: Exotic commercial forests

  • These are extensive forest areas planted with imported tree varieties like pine, wattle and eucalyptus.
  • These forests are mainly found in the Eastern Highlands where there was less competition with crop farming […]
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Natural Resources: Water pollution

By |2022-09-15T12:34:57+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

ZIMSEC O Level Geography Notes: Natural Resources: Water: Water pollution

  • Water pollution is the contamination of water bodies for example lakes, rivers, oceans, aquifers and groundwater.
  • This form of environmental degradation occurs when pollutants are directly or indirectly discharged into water bodies without adequate treatment to remove harmful compounds.
  • Water pollution can also be defined as the […]
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Ocean currents and the fishing industry

By |2022-09-15T12:34:44+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Ocean currents of the world. Image credit Pearson

ZIMSEC O Level Geography Notes: Natural Resources: Fishing:Ocean currents and the fishing industry

  • Ocean currents are important in the fishing industry as they affect the growth of plankton which provides fish food.
  • Warm ocean currents restrict the growth of plankton hence give rise […]
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Geothermal power: Introduction

By |2022-09-15T12:34:35+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Geothermal Power Station. Image credit MediaWiki

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Geothermal power

  • Geothermal power is generated using steam rhythmically shooting out from underground at high pressure in the form of geysers.
  • To control the movement of steam, an intricate network of pipes is installed collecting and directing the […]
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Advantages and Disadvantages of Solar energy

By |2022-09-15T12:34:22+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Solar Power Plant. Image credit sma-america.com

ZIMSEC O Level Geography Notes: Natural Resources: Energy:Advantages and Disadvantages of Solar energy

 Advantages

  • Renewable energy source.
  • Plentiful and inexhaustible.
  • Very clean.
  • Relatively cheap.
  • Can power vehicles.
  • Suitable even in remote areas.
  • High energy output.
  • No pollutions associated with it.

Disadvantages

  • Expensive for poor rural communities.
  • Affected […]
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Effects of mining on the environment

By |2022-09-15T12:35:23+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Gullying as a result of panning. Image credit Reuters

ZIMSEC O Level Geography Notes: Natural Resources Impact of mining on the environment

  • Deforestation and erosion as large areas are cleared when surface methods of mining are used.
  • Frequency of open quarries, trenches and pits may cause land degradation.
  • Infrastructure development which include the […]
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Uses,problems,solutions of commercial forests in Zimbabwe

By |2022-09-15T12:35:11+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Treated poles. Image credit wattle.co.zw

ZIMSEC O Level Geography Notes:Uses, problems and solutions of commercial forests

  • Commercial forests have different uses.
  • Some of which include:
    1. The pine and eucalyptus are mainly used for construction purposes, furniture making as well as in the pulp and paper industry.
    2. Treated eucalyptus poles are also […]
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Natural Resources: Water conservation

By |2022-09-15T12:34:56+02:00January 24th, 2023|Notes, O Level Geography, Ordinary Level Notes|

Conservation of water is important. Image credit voanews.com

ZIMSEC O Level Geography Notes: Natural Resources: Water:Water conservation

  • Water conservation is the management of water resources in ways that prevent them from pollution.
  • It includes all the policies, strategies and activities made to sustainably manage the natural resource fresh water.
  • It also […]
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