7th Science | Chapter 13 |Changes Physical & Chemical | Lecture 1| Maharashtra Board

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14:45

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Slow changes : soil fertilizing

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Ch 7
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Change & examples
1.physical - melting of ice
2. Chemical - rusting of iron
3. natural - floods
4. Man-made - making of tea
5. Useful - making of cloth
6. Harmful - spauling of milk
7. Fast - tear a paper
8. Slow - rotation of earth
9. Reversible - melting of candle
10. Non reversible - bursting of Crackers
11. Perodic - new year time
12. Non periodic - Earthquaks
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The changes that can occur in a forward and reverse direction again and again are called reversible changes

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