Final answer:
Metamorphic rocks have different mineral compositions and textures due to the effects of increased temperature, pressure, or the presence of chemically active fluids. The correct answer to the question is E) B and C.
Step-by-step explanation:
Metamorphic rocks are rocks that have been fundamentally transformed by high temperatures, high pressures, or the presence of chemically active fluids. Among the choices provided, the correct answer is B) have different mineral compositions due to increased temperature and pressure and C) have textures due to water and volatile magmatic fluids.
Thus, the most accurate answer would be E) B and C. Rocks undergo metamorphism meaning they change form; this process often results in new textures and mineral compositions without the rock melting into magma or lava.
The process of metamorphism does not involve any melting, and instead relies on a state known as the subsolidus, where temperatures are high, but not high enough to melt the rock.
Depending on the original rock type (protolith) and the conditions it's exposed to, different metamorphic rocks such as slate, schist, and marble can form with distinctive mineral alignments known as foliation.
It's also worth noting that the term metamorphic itself implies a change in form, which distinguishes these rocks from igneous rocks, which are born from cooling magma or lava, and sedimentary rocks, which form from the accumulation and lithification of sediment.