Question

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

• A. Making structures of sand on beach
• B. Melting of ice
• C. Cutting trees
• D. Making paper planes

Answer 1

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 their initial state. So they are reversible changes. But after cutting a tree, it cannot be put back in its previous state. So it's an irreversible change.