evaporation of water grinding of rock melting of ice rusting of iron
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Louis was investigating physical and chemical changes in matter. Which of these changes that Louis found involves a chemical change in matter?
Possibilities:
- evaporation of water
- grinding of rock
- melting of ice
- rusting of iron

rusting of iron