What is meant by the statement "every metamorphic rock has a parent rock"? view available hint(s)
a) all metamorphic rocks are created only through the change of preexisting rock.
b) all metamorphic rocks form from the cooling of previously melted rock.
c) metamorphic rocks share no similarities with the original material from which they formed.
d) all metamorphic rocks are created only from previous metamorphic rocks.
e) all metamorphic rocks are created only through accumulation of pieces of previously existing rocks.