Question

What are periodic and non-periodic changes? Explain with examples.
Is a forest fire a periodic or a non-periodic change?

Answer 1

Periodic changes are the changes that repeat themselves after a fixed interval of time.
Example - Change of season, day and night cycle, heart beat.

Non-periodic changes are the changes that do not repeat themselves after a fixed interval of time.
Example - Tornado, volcanic eruption, tsunami, etc. (most natural disasters).