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Answer :

1)\(\space \) The sawing of a piece of wood \(\rightarrow \)NO

2)\(\space \)The melting of ice candy \(\rightarrow \)YES

3) \(\space \)Dissolving sugar in water.\(\rightarrow \)YES

4)\(\space \)The cooking of food \(\rightarrow \)NO

5)\(\space \) The ripening of a mango\(\rightarrow \)NO

6)\(\space \)Souring of milk \(\rightarrow \)NO

- To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
- You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
- A drawing sheet changes when you draw a picture on it. Can you reverse this change?
- Give examples to explain the difference between changes that can or cannot be reversed.
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- A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?

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