1. Some rocks that already exist can be changed by high  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature and pressure into  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature rocks.
2. The high  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature is caused by the weight of all the rock layers above.
3. The word metamorphic means  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature in form and these rocks can be formed either soft  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature rocks or from the usually harder  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature rocks.
4. Some examples of metamorphic rocks are:
(a) the sedimentary rocks limestone and chalk can be changed into the very hard rock  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature,
(b) the sedimentary rock  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature is changed into the highly layered  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature used for roofing,
(c) the sedimentary rock  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature is changed into white 'sugary looking' quartzite.
5a. You do not usually find  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature in metamorphic rock even they were in the original sedimentary rock because the  changefossilshighigneousmarblemetamorphicpressuresandstonesedimentaryshaleslatetemperature temperature and pressure will destroy them.