How are periodic changes useful to man ?
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Explanation:
Whereas slow changes take place very slowly and may take hours, days or months to complete. Examples for fast changes: Burning of paper, Burning of a candle. Examples for slow changes: Rusting of iron, Germination of seed, curdling of milk etc.
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example of fast changes burning of a paper,burning of a candle.
example of slow changes rusting of iron
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