Which would show an example of how physical changes are reversible ?

Non-destructive physical changes

Explanation:

Hi, this is not a rule but most of the non-destructive physical changes are reversible.

In that group of changes you may find:

Think of a physical change and then try to figure out which process can reverse that.  

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'