Answer:
form or state. (Sometimes the teacher won't accept state as an answer.)
Step-by-step explanation:
For matter to change when moving from a solid state, it would have to be physically altered to be in, say, a liquid state. It's still the same product, it just had to change form. Ex: Solid to liquid. When you take an ice cube and melt it, it is still the same water, it's just in a different form or state.
Hope this helps! :)