Class: Primary 4

Term: 1st Term

Week: 1

Age: 9 years

Duration: 45 minutes


Subject: Basic Science and Technology 

Curriculum Theme: Basic Science 

Topic: Changes in Nature 

Content: Types of changesTemporary (Reversible) & Permanent (Irreversible)


  • Chart paper
  • Markers
  • Objects to demonstrate changes
  • Pictures showing changes
  • Notebooks and pencils


By the end of the lesson, pupils should be able to:

  • Explain the meaning of changes in nature
  • State the two types of changes
  • Explain the two types of changes in nature


Content Development: Changes in Nature

ContentTimeTeaching MethodTeacher’s Points/ActivitiesPupils’ Activities
Step 1: Introduction5 minutesDiscussionExplain the meaning of changes in nature.Listen and take notes.
Step 2: Types of changes10 minutesDiscussionDefine temporary (reversible) and permanent (irreversible) changes.Participate in the discussion and provide examples of each type of change.
Step 3: Temporary (Reversible) Changes10 minutesDemonstrationShow objects or pictures depicting temporary changes, such as melting ice or folding paper.Observe and identify the temporary changes demonstrated.
Step 4: Permanent (Irreversible) Changes10 minutesDemonstrationShow objects or pictures depicting permanent changes, such as burning paper or breaking a glass.Observe and identify the permanent changes demonstrated.
Step 5: Evaluation5 minutesQuestioningAsk questions related to the types of changes discussed.Respond to the questions asked.
Step 6: Note Copying5 minutesCopyingProvide a summary of the lesson for pupils to copy into their notebooks.Copy the notes into their notebooks.


Changes in nature

Changes in nature is the effect of things in nature or our environment becoming different from their original form. Changes in nature can be temporary (reversible) or permanent (irreversible). 

Types of changes in nature 

There are two types of changes in nature.

Temporary changes

Changes in Nature : Ice melting
Ice cubes melting – A temporary change

Temporary changes are when something becomes different from their original form but can go back to how it was before. For example, when ice melts, it becomes water, but if we freeze the water again, it becomes ice once more. These changes can be undone, like pressing a rewind button.

Permanent Change 

Changes in nature : Bonfire
Permanent Change: Bonfire Photo by Jens Mahnke on

Permanent changes are when something becomes different from their original form, and we can’t make it go back to how it was before. When something is permanently changed, it stays that way. For example, if we burn paper or wood, we can’t fix it to be the same as before. It’s like trying to unbreak an egg or change a grown man into a baby.

Understanding these types of changes helps us see and appreciate how things can be different in the world around us.


Ask the following questions to evaluate the lesson:

  1. What do changes in nature mean?
  2. What are the two types of changes we learned about?
  3. Can you give an example of a temporary change?
  4. Can you give an example of a permanent change?

Teaching Aids

  • Chart paper
  • Markers
  • Objects demonstrating changes (e.g., ice, paper, glass)
  • Pictures showing temporary and permanent changes

Note to Teachers:

Please note that the actual content of the lesson, teaching methods, and pupil activities may vary based on your specific teaching style, curriculum, or available resources. Feel free to customize the lesson note to fit the understanding and needs of your 9-year-old students.

Categorized in:

Lesson Notes,

Last Update: August 28, 2023