SUBJECT: BASIC SCIENCE
TERM: 1ST TERM
CLASS: PRIMARY 5
At the end of topic should be able to:
A chart showing different types of pollution.
Scheme of work
All relevant materials
9-Years Basic Education Curriculum
BUILDING BACKGROUND/CONNECTION TO PRIOR KNOWLEDGE:
Pupils are familiar with the topic in their previous classes.
Meaning of Pollution
Our environment is our surroundings. It consists of the living (biotic) and non-living (a biotic) elements of our surroundings. The three major components of the environment are physical, biological and socio-economic.
The environment contains every essential element which man needs to survive. At the same time, the environment contains potential hazards which pose threats to the existence of man and other living organisms. These hazardous elements are either natural or man-made.
Pollution means making the environment unsafe for plants and animals. When the air, water and land get contaminated" they become serious health hazards and security threats to man and other living organisms.
Pollutants are substances that are capable of contaminating the environment.
Pollutants can be in their solid, liquid and gaseous forms
Types and Causes of Pollution
Pollution may affect the soil, rivers, seas or the atmosphere. This means that there are many forms or types of pollution with different causes.
There are three major types of pollution, namely:
When we sweep the floor in our homes or compounds without first sprinkling water on the floor, dust rises into the air. Tractors also raise dust when they are used to cultivate farmland in dry weather. Lorries and cars raise dust as they move on roads, especially untarred roads.
Carbon dioxide is passed into the air whenever anything burns in air. Vehicles that use petrol or diesel add a lot of carbon dioxide to the air. The flaring of natural gas also causes the pollution of air with carbon dioxide.
Carbon monoxide is produced when fuel burns in an insufficient amount of atmospheric oxygen. There are reports of people who have died as a result of carbon monoxide poisoning when they operated their electric generators in homes with closed doors and windows.
Air pollution can be controlled in these four major ways:
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