Metamorphic rocks are formed from igneous, sedimentary, or other metamorphic rocks which contain minerals that have been changed by heat, pressure, or chemical action.
(Metamorphic rocks; are formed; from igneous, sedimentary, or other metamorphic rocks) (other metamorphic rocks; contain; minerals that have been changed by heat, pressure, or chemical action) (minerals; have been changed; by heat, pressure, or chemical action)
Metamorphic rocks other metamorphic rocks minerals
are formed contain have been changed
from igneous, sedimentary, or other metamorphic rocks
minerals that have been changed by heat, pressure, or chemical action
by heat, pressure, or chemical action