How are perodic change useful us
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1. Desirable - Changes that are useful to man are desirable changes.
Example- Change of milk into curd.
2. Undesirable - Change that brings about destruction is an undesirable change.
Example- Floods and epidemics are undesirable changes.
3. Periodic - Changes that are repeated at regular intervals of time are called periodic changes.
Examples- Change of day and night.
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Changes which are repeated after regular intervals are called periodic changes. . An example for periodic change is occurrence of day and night.
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