Answer :
Four examples of changes which can be reversed are:
1. Blowing of a balloon, which comes back to its original form when the air escapes out.
2. Rolling of the ball from a dough, which is a change only in the shape of the dough
3. Making a paper boat, by folding the paper. This can be reversed by opening up the folded paper.
4. Melting of ice cream in a hot room, which can be reversed by keeping it in the refrigerator.
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