reversible
Yes, this change is reversible.
This is a reversible process.
Although they both still have the same basic elements (i.e. pencil and lead vs water), there is a physical state change that occurs when you freeze water to make ice. Sharpening/shaving down a pencil only results in a difference of shape and size. It's about the same as ripping paper vs burning paper. Also, freezing water to make ice is a reversible change (you can melt ice to turn it back into water) and shaving a pencil is an irreversible change (you can't sharpen a pencil and then put the pencil shavings back onto the pencil.)
You think probable to a reversible reaction.
reversible
no soil is not reversible.
reversible!
A Bunsen burner is an object: it is not a process of any kind.
reversible
reversible
reversible