absolutely NOT!
Most coal is sedimentary, but anthracite is bituminous coal that has undergone metamorphosis to become a metamorphic rock.
Metamorphic rock
No. If a sedimentary rock has undergone even a low grade metamorphism, it is considered a metamorphic rock.
A METAMORPHIC rock is formed from other rocks that have undergone heat and pressure and partial but NOT entire melting. That is why a metamorphic rock could have layers that are distorted.
A metamorphic rock can become a igneous rock by melting and cooling
Marble was an metamorphic rock that was originally a sedimentary rock, which consist of limestone that has undergone heat and pressure metamorphosis under temperatures in excess of 1800ºF.
Metamorphic rock can not become igneous rock, however igneous rock can become metamorphic. This process happens over time as the rocks are shifted, compressed and heated by the Earth.
A pre-existing, igneous, sedimentary and metamorphic rock.
Any metamorphic rock can melt and recrystallize and become an igneous rock.
If the metamorphic rock becomes hot enough it can melt.
By definition a metamorphic rock has undergone recrystallization without melting - that requires a lot of heat and pressure. Marble is a metamorphic rock - it is recrystallized limestone or dolostone.
Metamorphic rock is given a grade from low to high depending on the amount of change it has undergone.