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Describe desirable, undesirable and periodic changes.

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Desirable -All those changes that are useful to man. For example-changing milk into the curd

Undesirable-All those changes that are not useful to man and are destructive. For example- Natural calamity

Periodic changes- All changes that occur at very regular intervals. For example-day and night change.

Final Answer-

Desirable -useful to the environment and the human being.
Undesirable-not useful to the environment
Periodic occurs after regular intervals.

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