science notes Archives - Free ZIMSEC & Cambridge Revision Notes

Marginal areas in Zimbabwe

By garikaib|2022-09-15T12:37:43+02:00September 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

A solar pump in a rural marginal area. Image credit massmaninter.com

A solar pump in a rural marginal area. Image credit massmaninter.com ZIMSEC O Level Combined Science Notes: Marginal areas in Zimbabwe

Large areas of Zimbabwe are marginal areas
Marginal areas are mostly located in the lowveld in western and southern […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Managing Ecosystems

By garikaib|2022-09-15T12:37:44+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 […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Protecting Water supplies

By garikaib|2022-09-15T12:37:44+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 […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Testing the purity of water

By garikaib|2022-09-15T12:37:45+02:00September 16th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Milk can be used to test the purity of water. Image credit wordpress.com

Milk can be used to test the purity of water. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Testing the purity of water

Materials: 4 test tubes, sterilised fresh milk, tap water, borehole water, spring water. plugs

Method

Collect water […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

The purification of Water

By garikaib|2022-09-15T12:37:45+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 […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Environmental Health: Air pollution

By garikaib|2022-09-15T12:37:46+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 […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Centralised Sewage Treatment Works

By garikaib|2022-09-15T12:37:46+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 […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Water closet/Flush toilet

By garikaib|2022-09-15T12:37:47+02:00September 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Water Closet. Image credit rakbathware.com

Water Closet. Image credit rakbathware.com ZIMSEC O Level Combined Science Notes: Water closet/Flush toilet

Is part of the water borne sewage
This means that wastes from the toilet are carried by water to a place where it is processed
This is very common in urban homes […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number:

Comments Off

Blair toilet

By garikaib|2022-09-15T12:37:47+02:00September 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Blair Toilet. Image credit thestandard.co.zw

Blair Toilet. Image credit thestandard.co.zw ZIMSEC O Level Combined Science Notes: Blair toilet

This was developed by the Blair Research Laboratory

The Blair Toilet.

It is a refinement of the pit latrine
They use […]
Quick NetOne, Econet, And Telecel Airtime Recharge

Number to recharge:

Airtime amount ($):

EcoCash number: