Write about the period and non periodic changes around
you.

Dear Student
Periodic Changes: Changes which are repeated after regular intervals are called periodic changes, e.g., the occurrence of day and night on earth, the change of seasons on earth, the change of periods in your school, rotation and revolution of earth, movement of clock hands.
Non-periodic changes: Changes which do not take place periodically are non-periodic changes, e.g., freezing of water to form ice, change of weather, natural disasters, Thunder and lightning, rusting of iron, etc
Regards

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