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Question

Which among the following is an example of an irreversible change?



A

Making structures of sand on beach        

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B

Melting of ice

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C

Cutting trees

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D

Making paper planes

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Solution

The correct option is C

Cutting trees


Structures made from sand can be broken back to sand, and paper planes can be unfolded to get back to their initial state. So they are reversible changes.

But once we cut a tree, we are essentially killing it! We can't stick the wood back and make the tree alive and one part again. (I wish we could)

Pro tip: Don't cut trees


Chemistry

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