blocked sunlight casts a shadow sunlight evaporates water from a lake oxygen absorbs sunlight forming ozone molecules a prism refracts sunlight into light of different wavelengths
I gave my students this multiple choice question: Which is the best example of a chemical reaction?

Only one answer is correct among these 4 choices:
- blocked sunlight casts a shadow
- sunlight evaporates water from a lake
- oxygen absorbs sunlight forming ozone molecules
- a prism refracts sunlight into light of different wavelengths

Could you tell me which one is correct?

oxygen absorbs sunlight forming ozone molecules