Which of the following statements concerning the rock cycle is true?
Select one:
a.
Any sedimentary rocks can be weathered to form sediments.
b.
Any rock can become a metamorphic rock except another metamorphic rock.
c.
All rocks can still be classified either as igneous or sedimentary even if they have been metamorphosed.
d.
As magma at extremely high temperature cools, it can become either an igneous or metamorphic rock.