leaves dropping from a tree leaves blowing in the wind leaves being burned in a fire leaves being crushed into pieces
I gave my students this multiple choice question: Which action causes a chemical change?

Only one answer is correct among these 4 choices:
- leaves dropping from a tree
- leaves blowing in the wind
- leaves being burned in a fire
- leaves being crushed into pieces

Could you tell me which one is correct?

leaves being burned in a fire