Answer: Ice melting
ICE MELTING,... because Ice melts slowly so which is not a chemical reaction... You are trying to find which is not a chemical reaction which would be Ice melting because,... heat and fire have a combination with each other!!
Step-by-step explanation:
Rust also has a chemical reaction because if you leave something outside yes it is going to rust that is a chemical reaction..
Also photosynthesis is plants decaying or sprouting that is also photosynthesis