Sources and Kinds of Pollution


      Students’ Learning Outcomes

·   Define pollution.
·  Describe different kinds of pollution.
·       Explain main causes of water, air and land pollution.


                                     Information for Teachers

·         Any change in the environment which may be harmful to living things is known as environmental pollution or simply “pollution”
·         Pollution may be caused by natural changes like floods, earthquakes, volcanoes.
·         The basic kinds of pollution are water pollution, air pollution and land pollution.
·         The main causes of water pollution are dirty and toxic water of industries and waste water from home. Pesticides mixed with water can also cause water pollution.
·         The main causes of land pollution are sewage and waste dumping; the mishandling of solid waste (garbage); cutting down trees; pesticides and use of other chemicals.

                                         Material / Resources

                       Pictures of land, water and air pollution and textbook

                                          Worm up Activity

Explain the concept of land, water and air pollution by simple activities:
·         Take a paper, cut out into different pieces and spread throughout the classroom then ask the students:
—–How do you see now the environment of the classroom?(Expected answer: Dirty)
·         Take two types of water (clean and dirty) into two different glasses. Ask students:
——Which water would you like to drink?
——Let the students explain why?
·         Now mix one type of water into the other.
——Would you like to drink this water (Expected answer: No)
·         Burn match stick in classroom and allow its smoke to spread in the surrounding. Ask students how do they feel?
·         Ask student:  what have they observed in these activities?
·         After the students’ respons: Introduce the today’s topic and write on the board.


Air pollution                                Water pollution                                        Land pollution

Activity 1

·         Show students the following pictures of air, land and water pollution and ask them which kind of pollution has been shown in pictures.
·         Car exhaust with smoke.
·         Dustbin with waste spread out.
·         Dirty water flowing out of a factory.
·         Heap of plastic bags.
·         Dying fish in a polluted pound.
pic 2
pic 1
Pic 4


pic 5
pic 3
·         Make the following table on board. Write the students responses underneath the appropriate section in the table.
Picture 1
Picture 2
Picture 3
Picture 4
Picture 5
Types of pollution

Activity 2                                                                                             Indicate the type of pollution caused by the following activities.

  Types of pollution
A man’s car engine is not perfect and it emits smoke when the car is driven. He changes the oil of the car himself and discards the used oil in the backyard.
A factory owner throws all of the factory’s waste water in the main sewage of the colony.
In the month of December, a family burns wood to get heat. The family throws the ashes into their house sanitary.
A restaurant owner wants an unobstructed view of the restaurant. So he cuts down all the trees that were growing in front of restaurant.
                                          Sum up / Conclusion
·         Any change in the environment which may be harmful to living things is known as pollution.
Sources and Kinds of Pollution
·         There are different kinds of pollution: water, air and land pollution.
·         The main causes of water pollution are dirty and toxic water from industries and used water from home.
·         The causes of air pollution include: the burning trash (plastic), the poisonous smoke and gases emitted from vehicles and factories and cutting of trees.
·         The main causes of land pollution are: throwing waste from houses, schools, and offices outside waste bins, by throwing plastic bags unnecessarily all over the place, cutting down of trees and by pesticides from farms.
Ask the students to answer the following question:
·         What is pollution?
·         What are the three types of pollution? Name one example of each.
·         How is sea water being polluted?
·         How can students contribute towards cleaning the environment?
·         What will happen if dead body of a cat remained in the open for a few days?
·         Write what do you know about pollution in your school environment? Identify one place where they have seen land pollution in the environment.
·         Involve the students in solving the questions given at the end of chapter / unit in textbook.



        Follow up
·     Ask students to complete the following task:
        –Collect their garbage for three days (Tell them that garbage is anything they discard or
   Throw away.
–Make a combined list of the garbage that they have collected in three days.
-Ask students to make two columns on chart paper. Label the two columns as (1) items collected and (2) how it can possibly be disposed. Also list possible methods by which this garbage could have been disposed.

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