It is time for Larry to go through some changes to be a metamorphic rock.The word metamorphic means "change" so it is going to have a lot of physical characteristics. So just like making a cookie, there is a lot of ingredients to this kind of rock.
The first thing Larry will go through is heat. The reason we need heat for Larry to become a metamorphic rock is so all of his magma he is made out of melts down. So it needs to be in high temperature so it can melt down.
The last thing that is really important is for Larry to have pressure. When subjected to pressure deep whiten earth, the rock's texture, and sometimes its mineral composition, changes. With heat and pressure, a metamorphic rock will form.